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#1 Posted : Thursday, June 11, 2015 3:06:59 AM(UTC)


Groups: Registered
Posts: 2

I'm having a similar problem, however my images are B&W, but listed as 24-bit color, which is unfortunate because I cannot diferentiate between them and my color images, so setting the codecs.Options.Pdf.Load.DisplayDepth property to 1 will not work.

I also have to display bitonal and color tiff images, for which RasterPaintDisplayModeFlags.ScaleToGray seems to be optimal.

Do you have any other recommendations?

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#2 Posted : Sunday, June 14, 2015 10:02:12 PM(UTC)


Groups: Registered, Tech Support
Posts: 179

Our moderator has split your post to a new thread.
Please provide full information about the case you're facing, because it may or may not be similar or related to the old issue where originally posted.

1. Which LEADTOOLS version are you using? The recent versions of the toolkit have the ability to detect PDF page colors and determine the bits per pixel value to rasterize them. Older versions always defaulted to 24-bits.

2. You can use this approach with different versions if it suits your needs:
  • Count the unique colors in the file using the ColorCountCommand Class function. If the number of colors is more than two, the image will not be black and white. This could happen if it contains non-black text or other color images or graphics objects:
  • ColorCountCommand MyCommand = new ColorCountCommand();
  • MyCommand.Run(RasterImage);
  • If the color count is 2, the image can be loaded as 1-bit. If it's between 3 and 256, it can be palettized (8-bits or less). If above 256, treat it as 24-bits.

3. If this doesn't solve your case, reply with more details and include a sample PDF file. If you attach files, put them in a ZIP or RAR file and do not use the Preview feature.
Mohamed Abedallah
Developer Support Engineer
LEAD Technologies, Inc.

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