My current approach is to load the tileset.png which contains all the tiles. I then use Image.crop() for every tile I want to extract. I then upscale them using Image.resize() by some arbitrary factor, because if I would let the scene upscale the 8x8 textures to something like 64x64, the performance drops hard. Using BytesIO I convert them to ui.Image without saving them on disk and from there I can load them as a scene.Texture.

But thank you for the hint that I can load the image and scale them in one operation!

All I had to do to fix the original problem was converting the tileset.png to RGB mode.

I found the problem: The images I used For testing where saved in P / Indexed Color mode. This can be checked with PIL

from PIL import Image

img = Image.open('sprite.png')
print(img.mode)
#> 'P'

I converted them with img = img.convert('RGB') and saved them again. Now it works. It seems that the Texture class cannot handle files in mode P and does not fail gracefully. This is probably an oversight.
Thank you again @cvp for taking your time to help! Much appreciated.

I now imported a photo I took with the iPad (JPG) via the little plus in the bottom left -> Import... -> Photo Library and it worked fine!

Maybe there is a problem using PNGs?

After testing with a bigger image (overworld_tileset.png, 565x564 px, 44kb) I got the same result.
Restarting Pythonista did not help, restarting the iPad did not help.

Thanks for the suggestion, but the image is in the same directory. It is really odd that it does work for you, but not for me.

I am on iOS 13.5 (17F75) with an iPad 7 and Pythonista 3.3 (330025)

Hi, I am trying to build a scene with custom textures, which I pre-process using PIL. From PIL I then convert them to ui.Image and then I want to load them as a Texture. Unfortunately, I cannot get them to load at all. Included is a minimum (non-) working example with a normal png in my project directory.

import ui, scene

image = ui.Image('sprite.png')
image.show()    # this works
texture = scene.Texture(image) # this fails
'''
Traceback (most recent call last):
  File "/private/var/mobile/Containers/Shared/AppGroup/73760516-2464-4322-8DCC-0525D46DFFC3/Pythonista3/Documents/smw/minimal_example.py", line 5, in <module>
    texture = scene.Texture(image)
ValueError: Could not load image
'''

texture = scene.Texture('sprite.png') # this fails as well
'''
Traceback (most recent call last):
  File "/private/var/mobile/Containers/Shared/AppGroup/73760516-2464-4322-8DCC-0525D46DFFC3/Pythonista3/Documents/smw/minimal_example.py", line 6, in <module>
    texture = scene.Texture('sprite.png')
ValueError: Image not found
'''

The sprite.png is a 32x32 PNG with a size of 981 bytes. I had no luck getting this to work with other images so far.
Any help is appreciated.

@disorientedp Yep, because of the jailbreak I'm staying on iOS 8 for now. But I will upgrade to iOS 9, if/when Pythonista stops supporting iOS 8, just like @JonB :P

@omz It seems to be working fine now, at least it doesn't crash when typing. If something else occurs, I'll let you know!

Whenever I try to write a file, as soon as I input any character via the onscreen keyboard, Pythonista crashes. I have not tested it with a bluetooth keyboard, but I assume it has to do with the autocompletion. In the console it works fine.

I am on an iPad mini 2 (I think it is model number is 4,4) with iOS 8.3. Also I should add that I am jailbroken.

The speed of Python lies mostly in development time. Python is not the fastest language execution wise, but getting something running is A LOT faster than in comparison to C or Java.

One bug I noticed is that when you press Tab in the console it will be converted to soaces, regardless of the 'soft-tabs' option.