[Gimp-user] Wronr reading of 16 bit tiff

2019-08-14 Thread AndyJP
>You could also try scanning as PNG, and see if that works.
>
>Liam (slave ankh on IRC)
Afaik, only linear response (raw) mode supported by vuescan is tiff.

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[Gimp-user] Wronr reading of 16 bit tiff

2019-08-13 Thread AndyJP
I try scanning to 48bit (16 bit per channel) TIFF with VueScan, but GIMP reads
it wrong, forwarding the data partially to alpha-channel. Probably, it is
interpreting 3-channel/16bit image as 4-channel/12bit encoded.
If not, I have no Idea where that 4-th alpha channel comes from (it is not
blank, but filled with some ghost from original image). So probably other
channels are also damaged.

There are also error messages appear:
"Incompatible type for 'RichTIFFIPTC'; tag ignored"
and
"Alpha channel type not defined for file C:\...\.tiff. Assuming alpha is not
premultiplied."

Is there a way to read 3-channel 48-bit TIFFs to GIMP correctly?

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[Gimp-user] When Color Managed Display is turned on in Windows?

2019-07-10 Thread AndyJP
>Does having the monitor profile on/off in either of Gimp / MS system
>affect the way out-of-gamut colors are shown?
>
>Otherwise, if there is no difference I would keep the monitor icm
>enabled in Gimp  (just on the basic of no-visible-difference).
>
>Want a better answer?  Best ask on https://discuss.pixls.us/

As I said, the profile is loaded in Windows 7 for correcting the monitor. And
yes, it affects the output significantly. So, I afraid of double correction,
because the exact mechanism is not explained in terms of source1,
source2->operation->output.

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[Gimp-user] When Color Managed Display is turned on in Windows?

2019-07-09 Thread AndyJP
What happens when "Color Managed Display" is turned on in Windows?
(and what about try to use system monitor profile checkbox?)

I have a software-corrected sRGB-gamma .icc profile loaded in Windows 7.
So the monitor displays more or less correct colors and relatively fine
intensity by default.

So should I define the same monitor profile in GIMP? When the colors are already
correct? If it adds to the image only difference of the mentioned profile with
OS-managed profile? so the correction is zero?

I guess,
If GIMP calculates difference of the mentioned profile with sRGB, then probably
colors should go out of control?

So should I set there my real monitor's profile, or sRGB, when the color is
managed by Windows?


Attachments:
* https://www.gimpusers.com/system/attachments/1213/original/Capture.PNG
* https://www.gimpusers.com/system/attachments/1214/original/Capture1.PNG

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