In testing Andrea's 3 tiff files, I found no differences between Tiff 4.1.0 compiled CinGG of April 24, 2020 with Tiff 4.1.7 compiled today.

The test images, according to mediainfo, came from Adobe Photoshop 22.5 (Macintosh) and when loaded look reasonable at the top and then fuzzy towards the bottom. Interestingly, I could not get them to load images using ffmpeg - either current 7.0 or 4.2 of April 2020.

TIFFFetchNormalTag: Warning, Incompatible type for "RichTIFFIPTC"; tag ignored -- with April 2020 and
FFVideoConvert::convert_picture_frame: sws_getCachedContext() failed -- with April 2025.

But the newly rendered images would load with either native Tiff or ffmpeg.

So bottom line is that the 4.7.0 Tiff is OK to be installed.

On Wed, Apr 16, 2025 at 1:19 AM Andrea paz <gamberucci.andrea@gmail.com> wrote:

With Cin-appimage (tiff 4.6.0) it is worse, test.tif and
test_color.tif are not even displayed in the timeline (no problem with
file_example_TIFF_5MB.tiff): FVideoConvert::convert_picture_frame:
sws_getCachedContext() failed
Instead with the build with 4.7.0 the problems arise only in rendering.
I put the link to the 3 files, if you want to test; but I am convinced
that it is not a problem of CinGG or libtiff, but only of the 2
images.

https://limewire.com/d/TMVWo#i2k1uHwWFN

Continuing to test, varying the names and bringing the extension from
tif to tiff, using one file instead of the 3 concatenated ones, etc.,
I always have different behaviors. Probably the cause is "me + the two
problematic images"!