Loading a large tif file but only first slice is loaded in openCV

Python
1

Hi ! I’m in a process to write a code in order to process my tiff files .

I manage to load tif files with 20 to 30 slices but when I proceed to work on my original files with 4000 slices only first slice is loaded . I don’t get any type of error. I even proceeded to re-save those files using FIJI image J into tiff files in case the originals were corrupted but same results .

So this print output 1 instead of 4000 slice . Again if I test with small piece of my original file with only 20 slices I get indeed 20 .

etval, mats = cv.imreadmulti(tif, flags=cv.IMREAD_GRAYSCALE)
    print(len(mats))

Opencv version : 4.5.1 Python version : 3.8.3

Any explanation or suggestion would be greatly appreciated .

2

unfortunately, support for tiff files is quite sparse in opencv.

rather try to use libtiff directly, not the imread() wrappers.

3

OpenCV must recently have gained the functions imreadmulti and imwritemulti

you seem to have encountered a bug! feel free to submit it as an issue on github (and check if it already exists before submitting)