| 2013-01-06 00:44:01 |
Michael Baudino |
description |
Hello,
While scanning any document (I use 150dpi for scanning, but the bug happens whichever scan resolution you use) and saving it as a PNG file, simple-scan sets incorrect resolution in PNG file headers. I noticed it when a friend opening it in Photoshop mentionned that my supposed-to-be A4 page was, in Photoshop, larger than a A0 page :-/
It seems that simple-scan actually sets a 72dpi resolution, disregarding the resolution you used to scan your document. Here is the output of `identify -verbose` on a scanned document : http://pastebin.com/7PQ8kWyk
When using mogrify from ImageMagick (`mogrify -density 150x150 <filename>`), we can force resolution in PNG headers. `identify -verbose` then rightly reports a 150x150 resolution and Photoshop is able to import it at the correct size (A4).
You will find attached an example of scanned document (some random chip-card of mine, actually) saved as PNG (but before I forced the PNG headers to 150x150)
Am I missing something ? Or is it a bug ?
I might run some more tests if it helps.
PS : I'm using an Epson Stylus SX445W
PS2 : AFAIK, resolution is correctly set when saving as PDF file, but there is the same bug when saving as JPG image.
PS3 : I'm using simple-scan-3.6.0-ubuntu1_amd64 from an up-to-date Lubuntu 12.10 |
Hello,
While scanning any document (I use 150dpi for scanning, but the bug happens whichever scan resolution you use) and saving it as a PNG file, simple-scan sets incorrect resolution in PNG file headers. I noticed it when a friend trying to open it in Photoshop mentionned that my supposed-to-be A4 page was, in Photoshop, larger than a A0 page :-/
It seems that simple-scan actually sets a 72dpi resolution, disregarding the resolution you actually used to scan your document. Here is the output of `identify -verbose` on a scanned document : http://pastebin.com/7PQ8kWyk
When using mogrify from ImageMagick (`mogrify -density 150x150 <filename>`), we can force resolution in PNG headers. `identify -verbose` then rightly reports a 150x150 resolution but Photoshop is still not able to import it at the correct size (A4).
You will find attached an example of scanned document (some random chip-card of mine, actually) saved as PNG (but before I forced the PNG headers to 150x150)
Am I missing something ? Or is it a bug ?
I might run some more tests if it helps.
PS : I'm using an Epson Stylus SX445W
PS2 : AFAIK, resolution is correctly set when saving as PDF file, but there is the same bug when saving as JPG image.
PS3 : I'm using simple-scan-3.6.0-ubuntu1_amd64 from an up-to-date Lubuntu 12.10 |
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