Images can't contain alpha channels or transparencies

Question

Apple has released new version of iTunes Connect & I got an error message when I tried to set Screenshots on itunes connect for my app.

\"Images can\'t c         


        

Answer 1

Exporting from Sketch

To avoid transparency, ensure no layer extends beyond the artboard bounds.

Answer 2

You can simply create a new Photoshop document and set its default background to White instead of Transparent. Then, copy and paste your image to the newly created document and save it.

Answer 3

Photoshop

1. Slice it
2. Save for web
3. Uncheck Transparency

Answer 4

I've found you can also just re-export the png's in Preview, but uncheck the Alpha checkbox when saving.

Answer 5

What worked for me here was using a jpg file instead of PNG as jpg files don't use alpha or transparency features. I did it via online image converter or you can also open the image in preview and then File->Export and uncheck alpha as option to save the image and use this image.

Answer 6

You can remove the alpha channel from a PNG file from the command line with pngcrush, using the flag "-c 2":

$ file input.png
input.png: PNG image data, 1024 x 1024, 8-bit/color RGBA, non-interlaced
$ pngcrush -q -c 2 input.png output.png
libpng warning: iCCP: known incorrect sRGB profile
$ file output.png
output.png: PNG image data, 1024 x 1024, 8-bit/color RGB, non-interlaced

Note the change from RGBA to RGB: the Alpha channel is gone!

pngcrush lives at http://pmt.sourceforge.net/pngcrush/