public RasterImage ReadThumbnail(
Stream stream,
CodecsThumbnailOptions options,
int pageNumber
)
- (nullable LTRasterImage *)readThumbnailFromStream:(LTLeadStream *)stream
options:(LTCodecsThumbnailOptions *)thumbnailOptions
pageNumber:(NSInteger)pageNumber
error:(NSError **)error
public RasterImage readThumbnail(ILeadStream stream, CodecsThumbnailOptions options, int pageNumber)
public:
RasterImage^ ReadThumbnail(
Stream^ stream,
CodecsThumbnailOptions options,
int pageNumber
)
def ReadThumbnail(self,stream,options,pageNumber):
stream
A Stream containing the image data from which the thumbnail image will be created.
options
Options for creating the thumbnail image.
pageNumber
1-based index of the page from which the thumbnail image should be created.
The RasterImage object that this method creates.
This method will always return a thumbnail image. Depending on the options passed, this method might read the stamp stored inside EXIF, CMP, JFIF and FlashPix files and return that. To read the file stamp only, use ReadStamp.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
using Leadtools.Svg;
public void ReadThumbnailExample()
{
RasterCodecs codecs = new RasterCodecs();
string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");
// Create a thumbnail with default options
CodecsThumbnailOptions options = CodecsThumbnailOptions.Default;
options.LoadStamp = false;
RasterImage thumbnail = codecs.ReadThumbnail(srcFileName, options, 1);
Debug.WriteLine("Thumbnail with default option:");
Debug.WriteLine(" Size: {0} by {1} pixels. Bits/Pixel: {2}", thumbnail.Width, thumbnail.Height, thumbnail.BitsPerPixel);
thumbnail.Dispose();
// Create a thumbnail with some options
options.LoadStamp = false;
options.Width = 40;
options.Height = 80;
options.ForceSize = true;
options.MaintainAspectRatio = false;
options.BackColor = RasterColor.FromKnownColor(RasterKnownColor.LightBlue);
options.BitsPerPixel = 8;
options.DitheringMethod = RasterDitheringMethod.None;
options.Order = RasterByteOrder.Rgb;
options.PaletteFlags = ColorResolutionCommandPaletteFlags.None;
options.Resample = false;
thumbnail = codecs.ReadThumbnail(srcFileName, options, 1);
Debug.WriteLine("Thumbnail with set option (size: {0} by {1}, Bits/Pixel: {2}, ForeSize: {3}",
options.Width, options.Height, options.BitsPerPixel, options.ForceSize);
Debug.WriteLine(" Size: {0} by {1} pixels. Bits/Pixel: {2}", thumbnail.Width, thumbnail.Height, thumbnail.BitsPerPixel);
thumbnail.Dispose();
codecs.Dispose();
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images";
}
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