ReadThumbnail(string,CodecsThumbnailOptions,int) Method (original) (raw)
Summary
Creates a thumbnail from the specified image file.
Syntax
C#
Objective-C
C++/CLI
Python
- (nullable LTRasterImage *)readThumbnailFromFile:(NSString *)file
options:(LTCodecsThumbnailOptions *)thumbnailOptions
pageNumber:(NSInteger)_pageNumber_
error:(NSError **)error
Parameters
fileName
A String containing the name of the file 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.
Return Value
The RasterImage object that this method creates.
Example
This example will read a thumbnail from a CMP file
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";
}
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