Merging photos - iPhone SDK

Question

I am making an app that adds a picture frame to a photo.

I would like to know how to have my Save button save both Images (the photo, and the frame) as one Image.

Right now it only saves one of the images.

In interface builder I have the save action saving the image that is loaded into an ImageView, with the frame ImageView overlaying that image.

I'd like to merge the two photos as one, so the save action can save the image with the frame.

Thanks!

Answer 1

This probably isn't what you want, but if you load both images into OpenGL (there's a nice Apple sample that loads images in OpenGL), lay one on top of the other, and then write the result to an image (excellent tutorial here - http://www.bit-101.com/blog/?p=1861).

You don't even need to render it to the screen, so there's no fiddling around with EAGL.

Answer 2

If you've displayed the frame over the photo in your UI, just use UIScreenGetImage something like

...
CGImageRef screen = UIGetScreenImage();
UIImage* image = [UIImage imageWithCGImage:screen];
CGImageRelease(screen);

// You could, e.g., save the captured image to photo album
UIImageWriteToSavedPhotosAlbum(image, self,  @selector(image:didFinishSavingWithError:contextInfo:), nil);