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Old 18-07-2005, 11:00
xenio
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Default CD11 Convert to Bitmap -> CMYK to Gray scale problem

Hi, any suggestion to this problem in coreldraw11:
if I import a CMYK image and convert it in grayscale using Convert to Bitmap
with the Transparent background check box enabled, I will get an image with
high contrast, totally useless.
If the image is in RGB the grayscale conversion is a lot better (with
transparency on or off there is no difference).

It's look like a problem in color profile or 32 bit image(the alpha
channel).

Any Idea to solve the problem?
Thanks.
Xenio.
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  #2  
Old 18-07-2005, 16:55
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Alex Alex is offline
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I can't offer any help on that one except to confirm that there is some kind of a problem here. It also presents itself in Draw 12 too...
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Old 19-07-2005, 04:14
xenio
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Nice, I hate CD12 I will never upgrade.

Anyway, don't think the problem is something like the Halo problem you explained?
I mean the remapping of the color space?
http://www.oberonplace.com/draw/tricks/halo.htm
I have tested it with Saturation or Perceptual engine but the result is the same.
It looks like a convertion without the color correction. take a try.

Thanks Alex.
Xenio

added:
in my site I've uploaded a rar with 2 bitmap and a cdr
www.maraeforbes.com/GrayscaleTEST.rar
anybody could test it?

Last edited by xenio; 19-07-2005 at 11:41.
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Old 19-07-2005, 08:44
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Quick question... Why "convert to bitmap" why not just change the mode to grayscale. That way you can go back and adjust the brightness and contrast as you see fit. I can email you the file that I created from your download. Just IM me or reply here. Attached is a JPG of the file...
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  #5  
Old 19-07-2005, 11:25
xenio
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Thanks ddonnahoe
quick answer you are right, changing the mode to grayscale does a great job...
but...the original images are 300 dpi so i need to reduce the dpi to 150 for the newspaper... anyway I can make this kind of reducing dpi in the export pdf filter.

Thanks this save me a lot of time.

Xenio
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Old 19-07-2005, 23:19
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If you need to change resolution, you can also go to Bitmap>Resample and do it there...
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Old 20-07-2005, 14:35
xenio
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Quote:
Originally Posted by Alex
If you need to change resolution, you can also go to Bitmap>Resample and do it there...
Yes, now I change the 'Mode' to grayscale and use resample or the option in PDF export,
anyway if someone want to test I the problem in in CD you can view my passage in a flash viewlet in my site...
http://www.maraeforbes.com/testcd11.htm
it's an Italian Version of CD but I think you can understand.

Let me know.
Thanks.
Xenio
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  #8  
Old 24-07-2005, 22:46
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That is one well done demonstration. I'll pass this on to the folks at Corel...
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