Bug 692495 - Tif conversion and resolution - customer tracking
Summary: Tif conversion and resolution - customer tracking
Status: NOTIFIED WORKSFORME
Alias: None
Product: Ghostscript
Classification: Unclassified
Component: Images (show other bugs)
Version: master
Hardware: PC All
: P2 normal
Assignee: Marcos H. Woehrmann
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2011-09-10 01:41 UTC by Marcos H. Woehrmann
Modified: 2011-09-11 22:10 UTC (History)
1 user (show)

See Also:
Customer:
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Description Marcos H. Woehrmann 2011-09-10 01:41:45 UTC
I have a .pdf file with a mix of text and images and I’m converting it to g4.tif with a resolution specified of –r300x300
In the tif that gets created, the images get blown up to a larger size than in the original .pdf. This is something our customer is complaining about.
I notice that if I set the resolution smaller, my image gets smaller.  Which is good for the image but some of the text gets less defined. Is there any way to maintain the resolution but keep the size of the original images? Or is this just a function of what I’m using to view the tif with? (Windows photo viewer)
Attached is a zip with the files in question and my commandline.
Comment 1 Alex Cherepanov 2011-09-10 03:31:44 UTC
I'm missing something here.

Every sampled image takes more space at higher resolution, although compression can reduce this effect to some degree. In fact, the source file + Ghostscript can be considered as a compression technique that only adds a constant to
the source file size.

Low resolution images lose details and develop aliasing effects.

Rendering of a PS or PDF file may upsample the embedded raster images and
result in larger output file that the source file.
Comment 2 Marcos H. Woehrmann 2011-09-11 22:10:11 UTC
Analysis showed it was a problem with the TIFF view the customer was using:

I took a look at the files you sent last week and it does appear to be a problem with the TIFF viewer you are using.  I loaded the Out2.tif file you sent into Apple Preview on my iMac. Printing the file to a printer using 100% scaling produces the correct output; the photos on pages 3 and 4 are printed smaller than the rest of the pages.  I've attached screenshots of the print preview page showing this.