According to tiffinfo (under Xubuntu) the properties of the Sane-generatd tiff file is
TIFF Directory at offset 0x11af5a (1159002)  Image Width: 4976 Image Length: 3190  Resolution: 600, 600 pixels/inch  Bits/Sample: 8  Compression Scheme: JPEG  Photometric Interpretation: YCbCr  Orientation: row 0 top, col 0 lhs  Samples/Pixel: 3  Rows/Strip: 16  Planar Configuration: single image plane  Reference Black/White:     0:    0  255     1:  128  255     2:  128  255  Software: xsane  DateTime: 2022:09:18 18:15:59  JPEG Tables: (574 bytes)When I load this file into Gimp, I get an error message about an incompatible TIFF format (additiona channels without the field ExtraSamples). It gives me choice to let the additional channel worlk as
* non pre-multiplied alpha * pre-multiplied alpha * channelI see no difference whatever choice I select. But this might be due to my sample.
However: When I try to adapt colors by the contrast curve, I see no Histogram under it.
** Is this due to the error message when loading the file? **I see histograms under the contrast curve for other tiff images not resulting from XSane.
Regards Adalbert Hanßen
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