The image is rotated 270 degrees after conversion

[wendyAndJken]

The image is rotated 270 degrees after conversion。
The width and height read from the original file are wrong。

I can't find the relevant reason, can you help me take a look?Thank you so much！
Original file：

[solidpixel]

Hi @wendyAndJken,

This issue occurs because your original JPEG is actually stored horizontally in the pixel data, and is presented as a portrait image in the OS because it is defined as "mirrored and rotated 270" using image EXIF metadata.

The current image loader (stb_image) in the compressor doesn't understand EXIF metadata, so the specified EXIF rotation is ignored and the compressor is using the raw pixels in their storage orientation.

The quickest workaround for this is to rotate the raw pixels before using the compressor. In Python 3, if you have the Pillow image processing package installed, the following code will apply the current EXIF transform to the pixels:

from PIL import Image, ImageOps
from PIL import ExifTags

# Input and output file names
input_image = 'issue_534_orig.jpg'
output_image = 'issue_534_transposed.jpg'

img = Image.open(input_image)

# Extract and print the EXIF info from the input image
img_exif = img.getexif()
orientation = img_exif.get(ExifTags.Base.Orientation)

if orientation is None:
    orientation_str = 'No EXIF rotation'
elif orientation == 1:
    orientation_str = '0° EXIF rotation'
elif orientation == 2:
    orientation_str = '0° EXIF rotation with mirror'
elif orientation == 3:
    orientation_str = '180° EXIF rotation'
elif orientation == 4:
    orientation_str = '180° EXIF rotation with mirror'
elif orientation == 5:
    orientation_str = '270° EXIF rotation with mirror'
elif orientation == 7:
    orientation_str = '90° EXIF rotation'
elif orientation == 6:
    orientation_str = '90° EXIF rotation with mirror'
elif orientation == 8:
    orientation_str = '270° EXIF rotation'
else:
    orientation_str = f'Unknown EXIF rotation value {orientation}'

print(f'Input image orientation: {orientation_str}')

# Rotate the pixel data to match the EXIF information
ImageOps.exif_transpose(img, in_place=True)
print(f'Input image orientation: 0° EXIF rotation')

# Save the transposed output file
img.save(output_image, quality=85)

[solidpixel]

Raised #539 to look at adding EXIF support, but this won't be a quick fix.