[misc] imread bug, snowing image

[archibate]

Describe the bug
imread cannot read jpg/png properly that are not generated by imwrite.

Log/Screenshots

To Reproduce

import taichi as ti
img = ti.imread('misc/logo.png')
ti.imshow(img)

If you have local commits (e.g. compile fixes before you reproduce the bug), please make sure you first make a PR to fix the build errors and then report the bug.

[archibate]

Maybe we want to share the same as gui.show(f'{frame}.png')?

[yuanming-hu]

Could you add more details here? Again, the issue description needs a lot more work. Please first fix the issue description. Thanks.

[archibate]

Found problem! It's axis flip!