[Kde-imaging] [Bug 140493] Ability of changing DPI-info in graphic-files
caulier.gilles at gmail.com
Wed Oct 3 16:51:54 CEST 2007
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------- Additional Comments From caulier.gilles gmail com 2007-10-03 16:51 -------
If i'm not too wrong Exif tags below are what you want to use :
0x011a XResolution rational64u IFD0
==> The number of pixels per <ResolutionUnit> in the <ImageWidth> direction. When the image resolution is unknown, 72 [dpi] is designated.
0x011b YResolution rational64u IFD0
==> The number of pixels per <ResolutionUnit> in the <ImageLength> direction. The same value as <XResolution> is designated.
0x0128 ResolutionUnit int16u IFD0 1 = None;2 = inches;3 = cm
==> The unit for measuring <XResolution> and <YResolution>. The same unit is used for both <XResolution> and <YResolution>. If the image resolution is unknown, 2 (inches) is designated.
If we use these tags, if will be very easy to adjust values with libkexiv2...
Adding/set DPI info require to rewrite whole image. This information is not on Exif/Iptc
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