On Sun, 2022-09-18 at 20:52 +0200, Adalbert Hanßen via gimp-developer- list wrote: > XSane produced a color scan from a document with 600 dpi and fill > color, > 1.1MB file size. I normally have XSane make a png file. For 8-bit per channel (0 to 255) images, you can also use the XSane gimp plugin, which is a lot easier, but make sure to export the file right away so you havwe a copy if gimp crashes or if you make a mistake :) > 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 > * channel > > I see no difference whatever choice I select. If you choose Channel, it'll be visible in Gimp's Channels dialogue. Otherwise, it's most like pre-multiplied alpha (transparency), and will most likely be "all opaque", so you can ignore it. > However: When I try to adapt colors by the contrast curve, I see no > Histogram under it. How large is the image? If you used the Line Art setting in XSane every pixel will be either 0 or 255, so the histogram is just two vertical lines, one at eacn end, that aren't really visible as they're right next to the edge. FOr a large image it can take a while for the background thread to count all the pixels in the image and fill in the histogram. > ** Is this due to the error message when loading the file? ** no. ankh / liam / demib0y -- Liam Quin - paligo.net, delightfulcomputing.com Cancer gofundme https://www.gofundme.com/f/5u9v7-every-little-helps Vintage pictures & texts https://www.fromoldbooks.org/ Full-time "slave" in voluntary servitude _______________________________________________ gimp-developer-list mailing list List address: gimp-developer-list@xxxxxxxxx List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list List archives: https://mail.gnome.org/archives/gimp-developer-list
