Re: [Gimp-developer] Some questions about tiff
- From: Liam R E Quin <liam holoweb net>
- To: Adalbert Hanßen <Adalbert Hanssen gmx de>, gimp-developer-list gnome org
- Subject: Re: [Gimp-developer] Some questions about tiff
- Date: Sun, 18 Sep 2022 16:32:18 -0400
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
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