3/23/2010 1:20 PM keltezéssel, Cristian Secară írta:
> On Tue, 23 Mar 2010 08:41:09 +0100, Tőkés Ábel wrote:
>>  From the behavior of these documents I got to the conclusion that
>> Word stores all bitmap pictures in a jpg format. This is independent
>> from the source of the picture (whether it was inserted as a picture
>> file or just pasted from the clipboard.) So, every time I save the
>> document, more and more jpeg errors are produced in all pictures.
> This is not true, or at least not true in just any case.
> Look at the these two snapshots
> http://www.secarica.ro/misc/png_test.png
> http://www.secarica.ro/misc/png_test_word_to_paint.png
> The png_test_word_to_paint.png is the result of this:
> I opened a blank Word document (Office 2003)
> I dragged the file test.png onto it
> I saved the document without closing
> I wrote something
> I closed the document with save
> I opened the document and wrote something
> I closed the document with save
> I opened the document
> I copied the image in clipboard
> I opened Paint and pasted the clipboard there
> I saved the image from Paint as .png
> Ok, the saved image has fewer colors (so it is no longer the perfect
> original), but as it looks it has *never* been in JPEG format.
> Cristi
You are right. I wasn't able to reproduce jpeg failures with Word.
I thought that it came from image compression,
but I wasn't able to make noise by it either. I will have to find out
where noisy images in my docs come from. It seems that Word is
more clever that I supposed.

For me it seems that the problem is with the pdf printer. I tried Adobe 
Elements and
CutePDF. Both added jpeg noise. Surprisingly, CutePDF gave somewhat 
better results,
though it was free and we paid for Elements, and I prefer Elements in 
most cases.

I am afraid we are becoming more and more offtopic, as this is obviously 
a pdf printer issue,
and probably office issue, but not Gimp issue.


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