Re: [Gimp-developer] Test some file plug-ins in master branch

[Michael Henning <drawoc darkrefraction com>]

Elle:
I think I just fixed the two issues you mentioned (exporting with
layers and importing grayscale tiffs). Could you grab the latest code
and test those again, to confirm that they're fixed?

(Note that there's an additional problem related to importing with
premultiplied alpha that I'll haven't fixed yet.)

  -- drawoc

On Fri, May 24, 2013 at 1:03 PM, Elle Stone <l elle stone gmail com> wrote:
> On 5/24/13, Mukund Sivaraman <muks banu com> wrote:
> > The following file plug-ins have been revised to use GIMP's new API.
> > I feel they need more testing as the changes are intrusive and the file
> > types can support a variety of pixel formats. I have tested these to my
> > satisfaction. Please test these if you can (master branch).
>
> > * file-tiff-save (test saving grayscale, RGB and indexed TIFF files
> >   incl. 16-bits per channel in the case of non-indexed)
>
> Tiff vary a bit in their internal structure, depending on which
> software generates the tiff, yes? So I'm planning on testing tiffs
> from several sources.
>
> I'm using Gentoo Linux. I rebuilt babl, gegl, and Gimp 2.9 from git
> this morning. So far I've tested some old 8-bit and 16-bit single
> layer tiffs that were created using Photoshop CS2 under Windows 2K (I
> did say old!):
>
> *8-bit and 16-bit color tiffs opened and exported properly; I was able
> to open the exported files with showFoto and each file looked right
> and had its appropriate bit depth.
>
> *converting 8-bit tiff to 16-bit tiff and exporting worked.
>
> *converting tiff to indexed and exporting worked.
>
> *converting 8-bit and 16-bit color tiffs to grayscale and exporting
> worked; the exported file opened with showFoto and looked exactly as
> expected. However, opening the exported 8-bit and 16-bit
> color-to-grayscale tiffs (that Gimp has just exported) with Gimp
> instead of showFoto didn't work. The images were too light in
> tonality, looked like they had been given a gamma 2.2ish correction.
> Upon exporting the newly opened grayscale image under a new name, the
> exported image then was also wrong in showFoto (showFoto can't
> actually work with or save grayscale image, instead converts to RGB
> before displaying the image).
>
> *Tiffs can support multiple layers and higher than 16-bit precision,
> which is not to say that Gimp is obligated to support these options.
> Exporting a two-layer tiff didn't work. Only one layer was exported
> and only about a third of the image on that layer was exported
> properly. Also changing precision to 32-bit floating point and
> exporting as a tiff resulted in a 16-bit tiff.
>
> Elle
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