Class PngOptions
Class PngOptions
Pôvodný názov: Aspose.Imaging.ImageOptions Zhromaždenie: Aspose.Imaging.dll (25.4.0)
Vytvorte vysoko kvalitné Portable Network Graphics (PNG) raster obrázky bez námahys našou API, ktorá ponúka prispôsobiteľné možnosti pre úrovne kompresie,bits na hĺbky pixelov, a alfa bitov. bezproblémovo spracovať XMP metadata kontajnery,zabezpečenie komplexného manažmentu metaúdajov obrazu a umožnenie prispôsobenia saPNG obrázky na vaše presné špecifikácie s ľahkosťou.
public class PngOptions : ImageOptionsBase, IDisposable, IHasXmpData, IHasMetadata, ICloneableInheritance
object ← DisposableObject ← ImageOptionsBase ← PngOptions
Derived
Implements
IDisposable , IHasXmpData , IHasMetadata , ICloneable
Z dedičných členov
ImageOptionsBase.Clone() , ImageOptionsBase.ReleaseManagedResources() , ImageOptionsBase.KeepMetadata , ImageOptionsBase.XmpData , ImageOptionsBase.Source , ImageOptionsBase.Palette , ImageOptionsBase.ResolutionSettings , ImageOptionsBase.VectorRasterizationOptions , ImageOptionsBase.BufferSizeHint , ImageOptionsBase.MultiPageOptions , ImageOptionsBase.FullFrame , ImageOptionsBase.ProgressEventHandler , DisposableObject.Dispose() , DisposableObject.ReleaseManagedResources() , DisposableObject.ReleaseUnmanagedResources() , DisposableObject.VerifyNotDisposed() , DisposableObject.Disposed , object.GetType() , object.MemberwiseClone() , object.ToString() , object.Equals(object?) , object.Equals(object?, object?) , object.ReferenceEquals(object?, object?) , object.GetHashCode()
Examples
Tento príklad ukazuje použitie rôznych tried z SaveOptions Namespace na exportné účely. obrázok typu Gif sa nahráva do príkladu Obrázok a potom sa vyváža do viacerých formátov.
string dir = "c:\\temp\\";
//Load an existing image (of type Gif) in an instance of Image class
using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.gif"))
{
//Export to BMP file format using the default options
image.Save(dir + "output.bmp", new Aspose.Imaging.ImageOptions.BmpOptions());
//Export to JPEG file format using the default options
image.Save(dir + "output.jpg", new Aspose.Imaging.ImageOptions.JpegOptions());
//Export to PNG file format using the default options
image.Save(dir + "output.png", new Aspose.Imaging.ImageOptions.PngOptions());
//Export to TIFF file format using the default options
image.Save(dir + "output.tif", new Aspose.Imaging.ImageOptions.TiffOptions(Aspose.Imaging.FileFormats.Tiff.Enums.TiffExpectedFormat.Default));
}Nasledujúci príklad ukazuje, ako previesť viacstránkový vektorový obrázok do formátu PNG vo všeobecnosti bez odkazu na konkrétny typ obrazu.
string dir = "C:\\aspose.imaging\\net\\misc\\ImagingReleaseQATester\\Tests\\testdata\\2548";
string inputFilePath = System.IO.Path.Combine(dir, "Multipage.cdr");
string outputFilePath = System.IO.Path.Combine(dir, "Multipage.cdr.png");
Aspose.Imaging.ImageOptionsBase exportOptions = new Aspose.Imaging.ImageOptions.PngOptions();
using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(inputFilePath))
{
exportOptions.MultiPageOptions = null;
// Export only first two pages. In fact, only one page will be rasterized because PNG is not a multi-page format.
Aspose.Imaging.IMultipageImage multipageImage = image as Aspose.Imaging.IMultipageImage;
if (multipageImage != null && (multipageImage.Pages != null && multipageImage.PageCount > 2))
{
exportOptions.MultiPageOptions = new Aspose.Imaging.ImageOptions.MultiPageOptions(new Aspose.Imaging.IntRange(0, 2));
}
if (image is Aspose.Imaging.VectorImage)
{
exportOptions.VectorRasterizationOptions = (Aspose.Imaging.ImageOptions.VectorRasterizationOptions)image.GetDefaultOptions(new object[] { Aspose.Imaging.Color.White, image.Width, image.Height });
exportOptions.VectorRasterizationOptions.TextRenderingHint = Aspose.Imaging.TextRenderingHint.SingleBitPerPixel;
exportOptions.VectorRasterizationOptions.SmoothingMode = Aspose.Imaging.SmoothingMode.None;
}
image.Save(outputFilePath, exportOptions);
}Tento príklad používa triedu Graphics na vytvorenie primitívnych tvarov na povrchu obrazu. Na preukázanie operácie, vzor vytvára nový obrázok vo formáte PNG a natáča primitívne tvary na obrazovej ploche pomocou metód natáčania vystavených triedy Graffics
//Creates an instance of FileStream
using (System.IO.FileStream stream = new System.IO.FileStream(@"C:\temp\output.png", System.IO.FileMode.Create))
{
//Create an instance of PngOptions and set its various properties
Aspose.Imaging.ImageOptions.PngOptions pngOptions = new Aspose.Imaging.ImageOptions.PngOptions();
//Set the Source for PngOptions
pngOptions.Source = new Aspose.Imaging.Sources.StreamSource(stream);
//Create an instance of Image
using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Create(pngOptions, 500, 500))
{
//Create and initialize an instance of Graphics class
Aspose.Imaging.Graphics graphics = new Aspose.Imaging.Graphics(image);
//Clear Graphics surface
graphics.Clear(Aspose.Imaging.Color.Wheat);
//Draw an Arc by specifying the Pen object having Black color,
//a Rectangle surrounding the Arc, Start Angle and Sweep Angle
graphics.DrawArc(new Aspose.Imaging.Pen(Aspose.Imaging.Color.Black, 2), new Aspose.Imaging.Rectangle(200, 200, 100, 200), 0, 300);
//Draw a Bezier by specifying the Pen object having Blue color and co-ordinate Points.
graphics.DrawBezier(new Aspose.Imaging.Pen(Aspose.Imaging.Color.Blue, 2), new Aspose.Imaging.Point(250, 100), new Aspose.Imaging.Point(300, 30), new Aspose.Imaging.Point(450, 100), new Aspose.Imaging.Point(235, 25));
//Draw a Curve by specifying the Pen object having Green color and an array of Points
graphics.DrawCurve(new Aspose.Imaging.Pen(Aspose.Imaging.Color.Green, 2), new[] { new Aspose.Imaging.Point(100, 200), new Aspose.Imaging.Point(100, 350), new Aspose.Imaging.Point(200, 450) });
//Draw an Ellipse using the Pen object and a surrounding Rectangle
graphics.DrawEllipse(new Aspose.Imaging.Pen(Aspose.Imaging.Color.Yellow, 2), new Aspose.Imaging.Rectangle(300, 300, 100, 100));
//Draw a Line
graphics.DrawLine(new Aspose.Imaging.Pen(Aspose.Imaging.Color.Violet, 2), new Aspose.Imaging.Point(100, 100), new Aspose.Imaging.Point(200, 200));
//Draw a Pie segment
graphics.DrawPie(new Aspose.Imaging.Pen(Aspose.Imaging.Color.Silver, 2), new Aspose.Imaging.Rectangle(new Aspose.Imaging.Point(200, 20), new Aspose.Imaging.Size(200, 200)), 0, 45);
//Draw a Polygon by specifying the Pen object having Red color and an array of Points
graphics.DrawPolygon(new Aspose.Imaging.Pen(Aspose.Imaging.Color.Red, 2), new[] { new Aspose.Imaging.Point(20, 100), new Aspose.Imaging.Point(20, 200), new Aspose.Imaging.Point(220, 20) });
//Draw a Rectangle
graphics.DrawRectangle(new Aspose.Imaging.Pen(Aspose.Imaging.Color.Orange, 2), new Aspose.Imaging.Rectangle(new Aspose.Imaging.Point(250, 250), new Aspose.Imaging.Size(100, 100)));
//Create a SolidBrush object and set its various properties
Aspose.Imaging.Brushes.SolidBrush brush = new Aspose.Imaging.Brushes.SolidBrush();
brush.Color = Color.Purple;
brush.Opacity = 100;
//Draw a String using the SolidBrush object and Font, at specific Point
graphics.DrawString("This image is created by Aspose.Imaging API", new Aspose.Imaging.Font("Times New Roman", 16), brush, new Aspose.Imaging.PointF(50, 400));
// save all changes.
image.Save();
}
}Constructors
PngOptions()
Initalizuje novú inštanciu triedy Aspose.Imaging.ImageOptions.PngOption.
public PngOptions()PngOptions(PngOptions)
Initalizuje novú inštanciu triedy Aspose.Imaging.ImageOptions.PngOption.
public PngOptions(PngOptions pngOptions)Parameters
pngOptions PngOptions
Možnosti PNG.
Fields
DefaultCompressionLevel
Predvolená úroveň kompresie.
public const int DefaultCompressionLevel = 6Fieldová hodnota
Properties
BitDepth
Získa alebo nastaví hodnoty bitovej hĺbky v rozmedzí 1, 2, 4, 8, 16.
Zvážte nasledujúce limity:
Aspose.Imaging.FileFormats.Png.Type.IndexedColor podporuje bitovú hĺbku 1, 2, 4, 8.
Aspose.Imaging.FileFormats.Png.pngColorType.Grayscale, Wl17.Doklady formátov.PG. PngColortýpky.grayScalWithAlpha podporuje bitovú hĺbku 8.
Aspose.Imaging.FileFormats.Png.pngColorType.Truecolor, Wl17.DataFormatov. Png ColorStyp.truecoulorVithAlpha podporuje bitovú hĺbku 8, 16.
public byte BitDepth { get; set; }Hodnota nehnuteľnosti
Examples
Tento príklad ukazuje, ako vytvoriť obrázok PNG s uvedenými možnosťami, vyplniť ho lineárnou gradientovou farbou a uložiť ho do súboru.
string dir = "c:\\temp\\";
Aspose.Imaging.ImageOptions.PngOptions createOptions = new Aspose.Imaging.ImageOptions.PngOptions();
// The number of bits per color channel
createOptions.BitDepth = 8;
// Each pixel is a (red, green, blue) triple followed by the alpha component.
createOptions.ColorType = Imaging.FileFormats.Png.PngColorType.TruecolorWithAlpha;
// The maximum level of compression.
createOptions.CompressionLevel = 9;
// Usage of filters allows to compress continuous tonal images more effectively.
createOptions.FilterType = Aspose.Imaging.FileFormats.Png.PngFilterType.Sub;
// Use progressive loading
createOptions.Progressive = true;
// Create a PNG image with custom parameters.
using (Aspose.Imaging.FileFormats.Png.PngImage pngImage = new Aspose.Imaging.FileFormats.Png.PngImage(createOptions, 100, 100))
{
Aspose.Imaging.Brushes.LinearGradientBrush gradientBrush = new Aspose.Imaging.Brushes.LinearGradientBrush(
new Aspose.Imaging.Point(0, 0),
new Aspose.Imaging.Point(pngImage.Width, pngImage.Height),
Aspose.Imaging.Color.Blue,
Aspose.Imaging.Color.Transparent);
Aspose.Imaging.Graphics graphics = new Aspose.Imaging.Graphics(pngImage);
// Fill the image with a semi-transparent gradient.
graphics.FillRectangle(gradientBrush, pngImage.Bounds);
// Save to a file.
pngImage.Save(dir + "output.explicitoptions.png");
}Nasledujúci príklad ukazuje, ako uložiť obrázok do formátu PNG pomocou rôznych možností.
string dir = "c:\\temp\\";
// Create a PNG image of 100x100 px.
// You can also load image of any supported format from a file or a stream.
using (Aspose.Imaging.FileFormats.Png.PngImage pngImage = new Aspose.Imaging.FileFormats.Png.PngImage(100, 100))
{
Aspose.Imaging.Brushes.LinearGradientBrush gradientBrush = new Aspose.Imaging.Brushes.LinearGradientBrush(
new Aspose.Imaging.Point(0, 0),
new Aspose.Imaging.Point(pngImage.Width, pngImage.Height),
Aspose.Imaging.Color.Blue,
Aspose.Imaging.Color.Transparent);
Aspose.Imaging.Graphics graphics = new Aspose.Imaging.Graphics(pngImage);
// Fill the image with the blue-transparent gradient.
graphics.FillRectangle(gradientBrush, pngImage.Bounds);
Aspose.Imaging.ImageOptions.PngOptions saveOptions = new Aspose.Imaging.ImageOptions.PngOptions();
// Progressive loading.
saveOptions.Progressive = true;
// Set the horizontal and vertical resolution to 96 pixels per inch.
saveOptions.ResolutionSettings = new Aspose.Imaging.ResolutionSetting(96.0, 96.0);
// Each pixel is a (red, green, blue) triple followed by alpha.
saveOptions.ColorType = Imaging.FileFormats.Png.PngColorType.TruecolorWithAlpha;
// Set the maximum level of compression.
saveOptions.CompressionLevel = 9;
// This is the best compression, but the slowest execution time.
// Adaptive filtering means that saving process will choose most sutable filter for each data row.
saveOptions.FilterType = Aspose.Imaging.FileFormats.Png.PngFilterType.Adaptive;
// The number of bits per channel.
saveOptions.BitDepth = 8;
// Save to a file.
pngImage.Save(dir + "output.png", saveOptions);
}ColorType
Získať alebo nastaviť typ farby.
public PngColorType ColorType { get; set; }Hodnota nehnuteľnosti
Examples
Nasledujúci príklad ukazuje, ako komprimovať obrázok PNG pomocou indexovanej farby s najlepšou paletou
// Loads png image
string sourceFilePath="OriginalRings.png";
string outputFilePath="OriginalRingsOutput.png";
using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(sourceFilePath))
{
image.Save(outputFilePath, new Aspose.Imaging.ImageOptions.PngOptions()
{
Progressive = true,
// Use indexed color type
ColorType = Aspose.Imaging.FileFormats.Png.PngColorType.IndexedColor,
// Use maximal compression
CompressionLevel = 9,
// Get the closest 8-bit color palette which covers as many pixels as possible, so that a palettized image
// is almost visually indistinguishable from a non-palletized one.
Palette = Aspose.Imaging.ColorPaletteHelper.GetCloseImagePalette((Aspose.Imaging.RasterImage)image, 256, Aspose.Imaging.PaletteMiningMethod.Histogram)
});
}
// The output file size should be significantly reducedTento príklad ukazuje, ako vytvoriť obrázok PNG s uvedenými možnosťami, vyplniť ho lineárnou gradientovou farbou a uložiť ho do súboru.
string dir = "c:\\temp\\";
Aspose.Imaging.ImageOptions.PngOptions createOptions = new Aspose.Imaging.ImageOptions.PngOptions();
// The number of bits per color channel
createOptions.BitDepth = 8;
// Each pixel is a (red, green, blue) triple followed by the alpha component.
createOptions.ColorType = Imaging.FileFormats.Png.PngColorType.TruecolorWithAlpha;
// The maximum level of compression.
createOptions.CompressionLevel = 9;
// Usage of filters allows to compress continuous tonal images more effectively.
createOptions.FilterType = Aspose.Imaging.FileFormats.Png.PngFilterType.Sub;
// Use progressive loading
createOptions.Progressive = true;
// Create a PNG image with custom parameters.
using (Aspose.Imaging.FileFormats.Png.PngImage pngImage = new Aspose.Imaging.FileFormats.Png.PngImage(createOptions, 100, 100))
{
Aspose.Imaging.Brushes.LinearGradientBrush gradientBrush = new Aspose.Imaging.Brushes.LinearGradientBrush(
new Aspose.Imaging.Point(0, 0),
new Aspose.Imaging.Point(pngImage.Width, pngImage.Height),
Aspose.Imaging.Color.Blue,
Aspose.Imaging.Color.Transparent);
Aspose.Imaging.Graphics graphics = new Aspose.Imaging.Graphics(pngImage);
// Fill the image with a semi-transparent gradient.
graphics.FillRectangle(gradientBrush, pngImage.Bounds);
// Save to a file.
pngImage.Save(dir + "output.explicitoptions.png");
}Nasledujúci príklad ukazuje, ako uložiť obrázok do formátu PNG pomocou rôznych možností.
string dir = "c:\\temp\\";
// Create a PNG image of 100x100 px.
// You can also load image of any supported format from a file or a stream.
using (Aspose.Imaging.FileFormats.Png.PngImage pngImage = new Aspose.Imaging.FileFormats.Png.PngImage(100, 100))
{
Aspose.Imaging.Brushes.LinearGradientBrush gradientBrush = new Aspose.Imaging.Brushes.LinearGradientBrush(
new Aspose.Imaging.Point(0, 0),
new Aspose.Imaging.Point(pngImage.Width, pngImage.Height),
Aspose.Imaging.Color.Blue,
Aspose.Imaging.Color.Transparent);
Aspose.Imaging.Graphics graphics = new Aspose.Imaging.Graphics(pngImage);
// Fill the image with the blue-transparent gradient.
graphics.FillRectangle(gradientBrush, pngImage.Bounds);
Aspose.Imaging.ImageOptions.PngOptions saveOptions = new Aspose.Imaging.ImageOptions.PngOptions();
// Progressive loading.
saveOptions.Progressive = true;
// Set the horizontal and vertical resolution to 96 pixels per inch.
saveOptions.ResolutionSettings = new Aspose.Imaging.ResolutionSetting(96.0, 96.0);
// Each pixel is a (red, green, blue) triple followed by alpha.
saveOptions.ColorType = Imaging.FileFormats.Png.PngColorType.TruecolorWithAlpha;
// Set the maximum level of compression.
saveOptions.CompressionLevel = 9;
// This is the best compression, but the slowest execution time.
// Adaptive filtering means that saving process will choose most sutable filter for each data row.
saveOptions.FilterType = Aspose.Imaging.FileFormats.Png.PngFilterType.Adaptive;
// The number of bits per channel.
saveOptions.BitDepth = 8;
// Save to a file.
pngImage.Save(dir + "output.png", saveOptions);
}CompressionLevel
Získajte alebo nastavíte úroveň kompresie Aspose.Imaging.FileFormats.Png.pngImage v rozmedzí 0-9.Čím vyššia je hodnota - tým efektívnejšie je komisia.
public int CompressionLevel { get; set; }Hodnota nehnuteľnosti
Examples
Nasledujúci príklad ukazuje, ako komprimovať obrázok PNG pomocou indexovanej farby s najlepšou paletou
// Loads png image
string sourceFilePath="OriginalRings.png";
string outputFilePath="OriginalRingsOutput.png";
using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(sourceFilePath))
{
image.Save(outputFilePath, new Aspose.Imaging.ImageOptions.PngOptions()
{
Progressive = true,
// Use indexed color type
ColorType = Aspose.Imaging.FileFormats.Png.PngColorType.IndexedColor,
// Use maximal compression
CompressionLevel = 9,
// Get the closest 8-bit color palette which covers as many pixels as possible, so that a palettized image
// is almost visually indistinguishable from a non-palletized one.
Palette = Aspose.Imaging.ColorPaletteHelper.GetCloseImagePalette((Aspose.Imaging.RasterImage)image, 256, Aspose.Imaging.PaletteMiningMethod.Histogram)
});
}
// The output file size should be significantly reducedTento príklad ukazuje, ako vytvoriť obrázok PNG s uvedenými možnosťami, vyplniť ho lineárnou gradientovou farbou a uložiť ho do súboru.
string dir = "c:\\temp\\";
Aspose.Imaging.ImageOptions.PngOptions createOptions = new Aspose.Imaging.ImageOptions.PngOptions();
// The number of bits per color channel
createOptions.BitDepth = 8;
// Each pixel is a (red, green, blue) triple followed by the alpha component.
createOptions.ColorType = Imaging.FileFormats.Png.PngColorType.TruecolorWithAlpha;
// The maximum level of compression.
createOptions.CompressionLevel = 9;
// Usage of filters allows to compress continuous tonal images more effectively.
createOptions.FilterType = Aspose.Imaging.FileFormats.Png.PngFilterType.Sub;
// Use progressive loading
createOptions.Progressive = true;
// Create a PNG image with custom parameters.
using (Aspose.Imaging.FileFormats.Png.PngImage pngImage = new Aspose.Imaging.FileFormats.Png.PngImage(createOptions, 100, 100))
{
Aspose.Imaging.Brushes.LinearGradientBrush gradientBrush = new Aspose.Imaging.Brushes.LinearGradientBrush(
new Aspose.Imaging.Point(0, 0),
new Aspose.Imaging.Point(pngImage.Width, pngImage.Height),
Aspose.Imaging.Color.Blue,
Aspose.Imaging.Color.Transparent);
Aspose.Imaging.Graphics graphics = new Aspose.Imaging.Graphics(pngImage);
// Fill the image with a semi-transparent gradient.
graphics.FillRectangle(gradientBrush, pngImage.Bounds);
// Save to a file.
pngImage.Save(dir + "output.explicitoptions.png");
}Nasledujúci príklad ukazuje, ako uložiť obrázok do formátu PNG pomocou rôznych možností.
string dir = "c:\\temp\\";
// Create a PNG image of 100x100 px.
// You can also load image of any supported format from a file or a stream.
using (Aspose.Imaging.FileFormats.Png.PngImage pngImage = new Aspose.Imaging.FileFormats.Png.PngImage(100, 100))
{
Aspose.Imaging.Brushes.LinearGradientBrush gradientBrush = new Aspose.Imaging.Brushes.LinearGradientBrush(
new Aspose.Imaging.Point(0, 0),
new Aspose.Imaging.Point(pngImage.Width, pngImage.Height),
Aspose.Imaging.Color.Blue,
Aspose.Imaging.Color.Transparent);
Aspose.Imaging.Graphics graphics = new Aspose.Imaging.Graphics(pngImage);
// Fill the image with the blue-transparent gradient.
graphics.FillRectangle(gradientBrush, pngImage.Bounds);
Aspose.Imaging.ImageOptions.PngOptions saveOptions = new Aspose.Imaging.ImageOptions.PngOptions();
// Progressive loading.
saveOptions.Progressive = true;
// Set the horizontal and vertical resolution to 96 pixels per inch.
saveOptions.ResolutionSettings = new Aspose.Imaging.ResolutionSetting(96.0, 96.0);
// Each pixel is a (red, green, blue) triple followed by alpha.
saveOptions.ColorType = Imaging.FileFormats.Png.PngColorType.TruecolorWithAlpha;
// Set the maximum level of compression.
saveOptions.CompressionLevel = 9;
// This is the best compression, but the slowest execution time.
// Adaptive filtering means that saving process will choose most sutable filter for each data row.
saveOptions.FilterType = Aspose.Imaging.FileFormats.Png.PngFilterType.Adaptive;
// The number of bits per channel.
saveOptions.BitDepth = 8;
// Save to a file.
pngImage.Save(dir + "output.png", saveOptions);
}FilterType
Získať alebo nastaviť typ filtra používaný počas procesu uložiť súbor png.
public PngFilterType FilterType { get; set; }Hodnota nehnuteľnosti
Examples
Tento príklad ukazuje, ako vytvoriť obrázok PNG s uvedenými možnosťami, vyplniť ho lineárnou gradientovou farbou a uložiť ho do súboru.
string dir = "c:\\temp\\";
Aspose.Imaging.ImageOptions.PngOptions createOptions = new Aspose.Imaging.ImageOptions.PngOptions();
// The number of bits per color channel
createOptions.BitDepth = 8;
// Each pixel is a (red, green, blue) triple followed by the alpha component.
createOptions.ColorType = Imaging.FileFormats.Png.PngColorType.TruecolorWithAlpha;
// The maximum level of compression.
createOptions.CompressionLevel = 9;
// Usage of filters allows to compress continuous tonal images more effectively.
createOptions.FilterType = Aspose.Imaging.FileFormats.Png.PngFilterType.Sub;
// Use progressive loading
createOptions.Progressive = true;
// Create a PNG image with custom parameters.
using (Aspose.Imaging.FileFormats.Png.PngImage pngImage = new Aspose.Imaging.FileFormats.Png.PngImage(createOptions, 100, 100))
{
Aspose.Imaging.Brushes.LinearGradientBrush gradientBrush = new Aspose.Imaging.Brushes.LinearGradientBrush(
new Aspose.Imaging.Point(0, 0),
new Aspose.Imaging.Point(pngImage.Width, pngImage.Height),
Aspose.Imaging.Color.Blue,
Aspose.Imaging.Color.Transparent);
Aspose.Imaging.Graphics graphics = new Aspose.Imaging.Graphics(pngImage);
// Fill the image with a semi-transparent gradient.
graphics.FillRectangle(gradientBrush, pngImage.Bounds);
// Save to a file.
pngImage.Save(dir + "output.explicitoptions.png");
}Nasledujúci príklad ukazuje, ako rôzne typy filtra ovplyvňujú veľkosť výstupného obrazu PNG.
Aspose.Imaging.FileFormats.Png.PngFilterType[] filterTypes = new Aspose.Imaging.FileFormats.Png.PngFilterType[]
{
Aspose.Imaging.FileFormats.Png.PngFilterType.None,
Aspose.Imaging.FileFormats.Png.PngFilterType.Up,
Aspose.Imaging.FileFormats.Png.PngFilterType.Sub,
Aspose.Imaging.FileFormats.Png.PngFilterType.Paeth,
Aspose.Imaging.FileFormats.Png.PngFilterType.Avg,
Aspose.Imaging.FileFormats.Png.PngFilterType.Adaptive,
};
foreach (Aspose.Imaging.FileFormats.Png.PngFilterType filterType in filterTypes)
{
Aspose.Imaging.ImageOptions.PngOptions options = new Aspose.Imaging.ImageOptions.PngOptions();
using (Aspose.Imaging.Image image = Image.Load("c:\\temp\\sample.png"))
{
// Set a filter type
options.FilterType = filterType;
using (System.IO.MemoryStream stream = new System.IO.MemoryStream())
{
image.Save(stream, options);
System.Console.WriteLine("The filter type is {0}, the output image size is {1} bytes.", filterType, stream.Length);
}
}
}
//The output may look like this:
//The filter type is None, the output image size is 116845 bytes.
//The filter type is Up, the output image size is 86360 bytes.
//The filter type is Sub, the output image size is 94907 bytes.
//The filter type is Paeth, the output image size is 86403 bytes.
//The filter type is Avg, the output image size is 89956 bytes.
//The filter type is Adaptive, the output image size is 97248 bytes.Nasledujúci príklad ukazuje, ako uložiť obrázok do formátu PNG pomocou rôznych možností.
string dir = "c:\\temp\\";
// Create a PNG image of 100x100 px.
// You can also load image of any supported format from a file or a stream.
using (Aspose.Imaging.FileFormats.Png.PngImage pngImage = new Aspose.Imaging.FileFormats.Png.PngImage(100, 100))
{
Aspose.Imaging.Brushes.LinearGradientBrush gradientBrush = new Aspose.Imaging.Brushes.LinearGradientBrush(
new Aspose.Imaging.Point(0, 0),
new Aspose.Imaging.Point(pngImage.Width, pngImage.Height),
Aspose.Imaging.Color.Blue,
Aspose.Imaging.Color.Transparent);
Aspose.Imaging.Graphics graphics = new Aspose.Imaging.Graphics(pngImage);
// Fill the image with the blue-transparent gradient.
graphics.FillRectangle(gradientBrush, pngImage.Bounds);
Aspose.Imaging.ImageOptions.PngOptions saveOptions = new Aspose.Imaging.ImageOptions.PngOptions();
// Progressive loading.
saveOptions.Progressive = true;
// Set the horizontal and vertical resolution to 96 pixels per inch.
saveOptions.ResolutionSettings = new Aspose.Imaging.ResolutionSetting(96.0, 96.0);
// Each pixel is a (red, green, blue) triple followed by alpha.
saveOptions.ColorType = Imaging.FileFormats.Png.PngColorType.TruecolorWithAlpha;
// Set the maximum level of compression.
saveOptions.CompressionLevel = 9;
// This is the best compression, but the slowest execution time.
// Adaptive filtering means that saving process will choose most sutable filter for each data row.
saveOptions.FilterType = Aspose.Imaging.FileFormats.Png.PngFilterType.Adaptive;
// The number of bits per channel.
saveOptions.BitDepth = 8;
// Save to a file.
pngImage.Save(dir + "output.png", saveOptions);
}Progressive
Získava alebo nastaví hodnotu, ktorá naznačuje, či je Aspose.Imaging.FileFormats.Png. PngImage progresívny.
public bool Progressive { get; set; }Hodnota nehnuteľnosti
Examples
Nasledujúci príklad ukazuje, ako komprimovať obrázok PNG pomocou indexovanej farby s najlepšou paletou
// Loads png image
string sourceFilePath="OriginalRings.png";
string outputFilePath="OriginalRingsOutput.png";
using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(sourceFilePath))
{
image.Save(outputFilePath, new Aspose.Imaging.ImageOptions.PngOptions()
{
Progressive = true,
// Use indexed color type
ColorType = Aspose.Imaging.FileFormats.Png.PngColorType.IndexedColor,
// Use maximal compression
CompressionLevel = 9,
// Get the closest 8-bit color palette which covers as many pixels as possible, so that a palettized image
// is almost visually indistinguishable from a non-palletized one.
Palette = Aspose.Imaging.ColorPaletteHelper.GetCloseImagePalette((Aspose.Imaging.RasterImage)image, 256, Aspose.Imaging.PaletteMiningMethod.Histogram)
});
}
// The output file size should be significantly reducedTento príklad ukazuje, ako vytvoriť obrázok PNG s uvedenými možnosťami, vyplniť ho lineárnou gradientovou farbou a uložiť ho do súboru.
string dir = "c:\\temp\\";
Aspose.Imaging.ImageOptions.PngOptions createOptions = new Aspose.Imaging.ImageOptions.PngOptions();
// The number of bits per color channel
createOptions.BitDepth = 8;
// Each pixel is a (red, green, blue) triple followed by the alpha component.
createOptions.ColorType = Imaging.FileFormats.Png.PngColorType.TruecolorWithAlpha;
// The maximum level of compression.
createOptions.CompressionLevel = 9;
// Usage of filters allows to compress continuous tonal images more effectively.
createOptions.FilterType = Aspose.Imaging.FileFormats.Png.PngFilterType.Sub;
// Use progressive loading
createOptions.Progressive = true;
// Create a PNG image with custom parameters.
using (Aspose.Imaging.FileFormats.Png.PngImage pngImage = new Aspose.Imaging.FileFormats.Png.PngImage(createOptions, 100, 100))
{
Aspose.Imaging.Brushes.LinearGradientBrush gradientBrush = new Aspose.Imaging.Brushes.LinearGradientBrush(
new Aspose.Imaging.Point(0, 0),
new Aspose.Imaging.Point(pngImage.Width, pngImage.Height),
Aspose.Imaging.Color.Blue,
Aspose.Imaging.Color.Transparent);
Aspose.Imaging.Graphics graphics = new Aspose.Imaging.Graphics(pngImage);
// Fill the image with a semi-transparent gradient.
graphics.FillRectangle(gradientBrush, pngImage.Bounds);
// Save to a file.
pngImage.Save(dir + "output.explicitoptions.png");
}Nasledujúci príklad ukazuje, ako uložiť obrázok do formátu PNG pomocou rôznych možností.
string dir = "c:\\temp\\";
// Create a PNG image of 100x100 px.
// You can also load image of any supported format from a file or a stream.
using (Aspose.Imaging.FileFormats.Png.PngImage pngImage = new Aspose.Imaging.FileFormats.Png.PngImage(100, 100))
{
Aspose.Imaging.Brushes.LinearGradientBrush gradientBrush = new Aspose.Imaging.Brushes.LinearGradientBrush(
new Aspose.Imaging.Point(0, 0),
new Aspose.Imaging.Point(pngImage.Width, pngImage.Height),
Aspose.Imaging.Color.Blue,
Aspose.Imaging.Color.Transparent);
Aspose.Imaging.Graphics graphics = new Aspose.Imaging.Graphics(pngImage);
// Fill the image with the blue-transparent gradient.
graphics.FillRectangle(gradientBrush, pngImage.Bounds);
Aspose.Imaging.ImageOptions.PngOptions saveOptions = new Aspose.Imaging.ImageOptions.PngOptions();
// Progressive loading.
saveOptions.Progressive = true;
// Set the horizontal and vertical resolution to 96 pixels per inch.
saveOptions.ResolutionSettings = new Aspose.Imaging.ResolutionSetting(96.0, 96.0);
// Each pixel is a (red, green, blue) triple followed by alpha.
saveOptions.ColorType = Imaging.FileFormats.Png.PngColorType.TruecolorWithAlpha;
// Set the maximum level of compression.
saveOptions.CompressionLevel = 9;
// This is the best compression, but the slowest execution time.
// Adaptive filtering means that saving process will choose most sutable filter for each data row.
saveOptions.FilterType = Aspose.Imaging.FileFormats.Png.PngFilterType.Adaptive;
// The number of bits per channel.
saveOptions.BitDepth = 8;
// Save to a file.
pngImage.Save(dir + "output.png", saveOptions);
}
