Re: [Gimp-user] Wronr reading of 16 bit tiff

[Tobias Jakobs <tobias jakobs gmail com>]

Hi Andy,

please open an issue in the Gimp issue tracker and attach an example file:
https://gitlab.gnome.org/GNOME/gimp/issues

Some scanners create  4-channel/12bit encodedimages. Then the 4th channel
is an IR channel that is useful for reducing dust.

Regards,
Tobias

Am Mi., 14. Aug. 2019 um 07:04 Uhr schrieb AndyJP <forums gimpusers com>:

> 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?
>
> --
> AndyJP (via www.gimpusers.com/forums)
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