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LoadCmykPlanes(Stream,int,int) Method

Summary

Loads CMYK TIFF or JPEG streams as CMYK and avoids the colorspace conversion to RGB.

Syntax
C#
VB
Objective-C
C++
Java
public RasterImage LoadCmykPlanes( 
   Stream stream, 
   int bitsPerPixel, 
   int pageNumber 
) 
Public Overloads Function LoadCmykPlanes( _ 
   ByVal stream As Stream, _ 
   ByVal bitsPerPixel As Integer, _ 
   ByVal pageNumber As Integer _ 
) As RasterImage 
- (nullable LTRasterImage *)loadCmykPlanesFromStream:(LTLeadStream *)stream  
                                        bitsPerPixel:(NSInteger)bitsPerPixel  
                                          pageNumber:(NSInteger)pageNumber  
                                               error:(NSError **)error 
public RasterImage loadCmykPlanes(ILeadStream stream, int bitsPerPixel, int pageNumber) 
public: 
RasterImage^ LoadCmykPlanes(  
   Stream^ stream, 
   int bitsPerPixel, 
   int pageNumber 
)  

Parameters

stream
A Stream containing the data of the image file to load. The image data must be CMYK; otherwise, the method will fail and throw an exception.

bitsPerPixel
Resulting image pixel depth. Possible values are:

Value Meaning
0 Each plane will have the same bits/pixel as the source file (8 or 16).
8 Each plane will be a grayscale 8 bits per pixel image.
16 Each plane will be a grayscale 16 bits per pixel image. This is not available for saving JPEG CMYK files.

pageNumber
1-based index of the page from which the planes should be loaded.

Return Value

A RasterImage that this method loads. The image will contain one page for each of the CMYK planes.

Remarks

If the data does not have to be loaded as CMYK, use Load or LoadAsync.

Support for 16-bit grayscale images is only available in the Document/Medical Imaging editions.

This method will fail if the input file is not TIFF or JPEG CMYK. Note that not all the pages have to be CMYK - it is enough if only the page that you wish to load is CMYK.

Only the following memory load options are supported by this method:

This method uses the values of RasterCodecs.Options.Tiff.Load.ImageFileDirectoryOffset.

If the image being loaded contains alpha channel information, the alpha channel(s) will be loaded as well. First alpha channel will be stored as page 5, second alpha as plane 6, etc.

Use RasterImagePainter.PaintCmykPlanes to display the array and SaveCmykPlanes to save an image as a CMYK TIFF or JPEG file.

If you want to convert the CMYK array to a regular BGR image and use the other methods or save to a file format other than TIFF CMYK, use ColorMergeCommand and set the ColorMergeCommand.Type to ColorMergeCommandType.Cmyk.

If you have an alpha image, use RasterImage.SetAlphaImage to set the alpha image.

You can apply image processing on each individual image. This allows you to process each color plane separately.

If you want to load a non-CMYK file as an array of color planes, use the normal Load or LoadAsync methods and then use the ColorSeparateCommand and RasterImage.CreateAlphaImage methods.

Example

Refer to LoadCmykPlanes.

Requirements

Target Platforms

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