It is my hope that these few examples will help to solve those small, quick modifications that you may need to apply to an image. Even if you don’t have time to learn advanced computer graphics, GIMP can still be a very useful and handy tool for quick image modifications. So you installed GIMP on your computer, congratulations! GIMP is a very powerful image manipulation software, but don’t let that intimidate you. 'Įcho 'brew not installed, trying to install.

# make sure to have imagemagick installed, see :Įcho 'imagemagick not installed, trying to install.

# make sure to have brew installed, see :

# remove alpha channel from PNG images when App Store upload fails It uses brew to install imagemagick if not available, so I guess it will run only on Mac. I put Nikita Pushkar's very nice solution into a shell script that converts all iOS icons found in res/icon/ios: Select all (⌘+a), and then select File > Export Selected Images… > Expand Options > uncheck the Alpha checkbox > Choose (your destination folder)ĭone! All your images are now exported with the alpha channel stripped off. The way I got batch exporting to work was to select all my app icon assets in finder > right click > open (or open with preview)Īll of the assets will now appear in the same window. Underneath More info, it showed:įound the solution above to use Preview to remove the alpha channel by exporting it with the Alpha checkbox unchecked, but figured a way to batch export them since I had 18 assets I needed to strip the alpha channel from. I confirmed that my app store icons did include the alpha channel by locating the asset in Finder and looking up its info (⌘+i). The App Store icon in the asset catalog in 'MyApp.app' can't be transparent nor contain an alpha channel.' Just got the the following error when trying to upload my app to the iTunes app store:ĮRROR ITMS-90717: 'Invalid App Store Icon.

Change icon picture mac jpeg