Iphone – Saving a PNG (or good quality JPG) image to the Photos Library

iphonejpegpnguiimage

Scenario
Saving a 320×480 view as an image in the user's saved photos album.

Problem
Always saves a 800x?, low quality JPG.

Using the normal renderInContext/UIImageWriteToSavedPhotosAlbum method to save a view to the library. I've tried converting the UIImage to a PNGRepresentation then using that data to make a new UIImage – it still just saves a JPG in the library.

I could possibly solve this problem by upsizing my view to 800px tall then take the "screenshot" – but that's going to be a lot of work.

Has anyone been able to solve this low-quality saved image problem? I've seen threads all over about it but the always die off without any solid ideas.

Thanks,
Ian

Best Answer

The best answer of this question can be found here. I'll paste it just in case something happens in the future which would make the link invalid:

UIImage* im = [UIImage imageWithCGImage:myCGRef]; // make image from CGRef
NSData* imdata =  UIImagePNGRepresentation ( im ); // get PNG representation
UIImage* im2 = [UIImage imageWithData:imdata]; // wrap UIImage around PNG representation
UIImageWriteToSavedPhotosAlbum(im2, nil, nil, nil); // save to photo album

Thanks to Ben Weiss for this.

Related Topic