Error while reading some TIFF images with transparency

[soyosaki]

It appears that many TIFF images produced by tools like PhotoShop stores transparency for TIFF images as an extra sample for the color space without transparency (e.g. declaring photometric interpretation to be RGB color & use 4 samples / pixel with the extra unspecified sample being the alpha channel). As a solution to this, when the declared photometric intepretation does not contain an alpha channel, we should:

1. detect the existence of extra samples and find if any of them is associated alpha
2. and if there is any extra sample, intepret the first unspecified extra sample as the alpha channel
   This should make TIFF images produced by these softwares readable.

[197g]

What version are you using, we do detect (and skip or convert to alpha) extra samples for many images now since 0.11. Also you're referring to Photoshop but that is very hard to follow without at least an example image that could be validated as working eventually.

[soyosaki]

@197g according to EXIF its Adobe PhotoShop 27.3. I will need to find a way to redact certain EXIF as it does contain sensitive info 😂, will post the processed image then.

[197g]

Sorry for the confusion. I meant version of tiff, not Photoshop.