SetTrnsChunk Method (original) (raw)
Summary
Sets the alpha transform chunk of the PNG file.
Syntax
C#
Objective-C
C++/CLI
Java
Python
public void SetTrnsChunk(
byte[] _chunk_
)
@property (nonatomic, strong, nullable) NSData *trnsChunk public void setTrnsChunk(byte[] chunk) public:
void SetTrnsChunk(
array<byte>^ _chunk_
)
def SetTrnsChunk(self,chunk): Parameters
chunk
An array of bytes that represents the alpha transform chunk of the PNG file.
Example
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;
public void CodecsPngOptionsExample()
{
RasterCodecs codecs = new RasterCodecs();
string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");
RasterImage image = codecs.Load(srcFileName);
codecs.Options.Png.Load.SetTrnsChunk(codecs.Options.Png.Load.GetTrnsChunk()); // CodecsPngOptions & CodecsPngLoadOptions reference
// save with maximum quality
codecs.Options.Png.Save.QualityFactor = 1; // CodecsPngSaveOptions reference
codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "quality.png"), RasterImageFormat.Png, image.BitsPerPixel);
// save with maximum compression
codecs.Options.Png.Save.QualityFactor = 9;
codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "compression.png"), RasterImageFormat.Png, image.BitsPerPixel);
// calculate the stamp size to fit into 320 by 240 pixels keeping the aspect ratio
LeadRect rc = new LeadRect(0, 0, 320, 240);
rc = RasterImage.CalculatePaintModeRectangle(image.ImageWidth, image.ImageHeight, rc,
RasterPaintSizeMode.FitAlways, RasterPaintAlignMode.Near, RasterPaintAlignMode.Near);
codecs.Options.Png.Save.QualityFactor = 4;
codecs.Options.Png.Save.SaveWithStamp = true;
codecs.Options.Png.Save.StampWidth = rc.Width;
codecs.Options.Png.Save.StampHeight = rc.Height;
codecs.Options.Png.Save.StampBitsPerPixel = 24;
codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "WithStamp.png"), RasterImageFormat.Png, image.BitsPerPixel);
// Clean up
image.Dispose();
codecs.Dispose();
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images";
}
Leadtools.Codecs Assembly
CompactFile(Stream,Stream,int,int,bool,int,int,bool,int,CodecsSavePageMode,bool,bool) Method
CompactFile(Stream,Stream,int,int,bool,long,int,bool,long,CodecsSavePageMode,bool,bool,bool) Method
CompactFile(string,string,int,int,bool,int,int,bool,int,CodecsSavePageMode,bool,bool) Method
CompactFile(string,string,int,int,bool,long,int,bool,long,CodecsSavePageMode,bool,bool,bool) Method