Image widht/height not properly detected for TIFs with multiple layers.

[lnielsen]

Describe the bug

This code does not properly handle cases where an image file contains multiple images.

A test image is available on https://sandbox.zenodo.org/records/12129 with 5 images. The first being 4332 × 6804 the last being 135x212. The method detects the last image as the width/height, but we display the first.

Solution

For the test case the right width/height can found like this:

from wand.image import Image
with open(filename, "rb") as fp:
    with Image.ping(file=fp, format=ext) as img:
        imgseq = img.sequence[0]
        width = imgseq.width
        height = imgseq.height

Above should be tested on a suite of different images and types to ensure it works reliably.

Steps to Reproduce

Upload an image and check the IIIF manifest:
https://sandbox.zenodo.org/api/iiif/record:12129:2007-09-28_16-29-41.pyr.tif/info.json

Expected behavior

• Extracts the width/height of the first image.
• This requires reprocessing all images on Zenodo and probably other instances so we need to provide a script.

Additional context

% identify /Users/lnielsen/Downloads/2007-09-28_16-29-41.pyr.tif
2007-09-28_16-29-41.pyr.tif[0] TIFF 4332x6804 4332x6804+0+0 8-bit sRGB 5.19315MiB 0.010u 0:00.001
2007-09-28_16-29-41.pyr.tif[1] TIFF 2166x3402 2166x3402+0+0 8-bit sRGB 0.010u 0:00.001
2007-09-28_16-29-41.pyr.tif[2] TIFF 1083x1701 1083x1701+0+0 8-bit sRGB 0.010u 0:00.001
2007-09-28_16-29-41.pyr.tif[3] TIFF 541x850 541x850+0+0 8-bit sRGB 0.010u 0:00.001
2007-09-28_16-29-41.pyr.tif[4] TIFF 270x425 270x425+0+0 8-bit sRGB 0.010u 0:00.001
2007-09-28_16-29-41.pyr.tif[5] TIFF 135x212 135x212+0+0 8-bit sRGB 0.000u 0:00.001