Can someone please explain to me 'alpha channels'

[tonywalker23]

Im trying to submit a webapp for my site to apple. i know very little about graphics and i keep getting an error when i try to upload an icon.

"Icon image upload does not contain a recognized alpha channel, please correct image."

can someone please explain to me what i need to do.

THANKS!

 

[IgnatiusTheKing]

Im trying to submit a webapp for my site to apple. i know very little about graphics and i keep getting an error when i try to upload an icon.

"Icon image upload does not contain a recognized alpha channel, please correct image."

can someone please explain to me what i need to do.

THANKS!

An alpha channel is a way to make part of the image transparent by masking the part of the image you want to make invisible.

In Photoshop, creating an Alpha Channel is as easy as selecting the part of the object you want to see and using the Save selection as channel option in the Channels palette. In Preview, you can use the Instant Alpha tool (hold down the Select button in the tool bar and choose it from the drop-down).

 

[candyman]

Although the software is outdated here, this link may help as the process itself has not changed.

Photoshop Alpha Channel