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#1 Posted : Thursday, March 24, 2005 8:21:46 AM(UTC)

Groups: Registered
Posts: 32

I don’t know why you Lead folks can’t deal with CMYK but it’s driving me nuts.

LeadTools v13

I create a 32 bit / pixel bitmap

Fill the pixels / channels with the data that I want.

When I go to save it I use

L_SaveFile(szFileName, &pI->m_Image, FILE_TIF_CMYK, 24, 1, 0, NULL, NULL, NULL);

If I change the 24 to either 0 or 32 I get a 5-channel tif, I just want 4 (CMYK).

Also, when I go to read the file back in (not with Lead because it does not work) I use the TIFFLIB

The channel data is NOT my original data BUT a 32 bit / pixel RGB with the 4th channel set to zero.

Can you point me in the write direction for both read and writing of CMYK TIF files.

Does version 14 address this better than previous versions ?

Thanks in advance


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#2 Posted : Thursday, April 28, 2005 11:54:50 AM(UTC)


Groups: Tech Support
Posts: 23

Thanks: 3 times

In the current and past versions of LEADTOOLS, we convert CMYK data to RGB internally when loading files. When saving files, we convert RGB data to CMYK during the save. In version 14.5 (due later this year) we will have new functions that allow you to load images and keep the CMYK channels seperate. When saving, you will be able to save CMYK files from the 4 seperate channels, without doing any RGB => CMKY conversion.

Edit by Moderator:
Newer versions of LEADTOOLS contain functions for loading and saving CMYK channels in TIF and some other image file types without the need to convert to RGB and back.

Edited by moderator Saturday, October 1, 2016 8:36:28 PM(UTC)  | Reason: Not specified

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