xcode - How to make partly transparent png-image buttons for iPhone? -


my iphone app has custom buttons display png-images. replace white color in images transparent color. there tool on mac allows me that? (or there other way indicate color transparent in xcode?)

the preview application has mode on select tool called "instant alpha" eases selection of backgrounds. once have background selected, can press "delete" key , area of image removed. save png "alpha" box checked , you're done.

most other image editing tools, particularly supporting multiple layers in image, support png alpha channels. these easier using preview, third-party , many cost money need make decision.

please note if starting image solid background things have faded edge blends in background, unlikely you'll able remove background entirely satisfaction without cutting in actual image.

you may have seen gif images in past designed blend in on white background , had bright pixels @ edges stood out , ugly on darker backgrounds. image saved png or other format alpha channel beginning not have problem.


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