Invalid PNG Image file: iDOT doesn't point to valid IDAT chunk

Question

I have some HTML content pages in an app and I'm using a UIWebView to display them. Some of these pages have a PNG image in them that is generating the following message in the debug console in xcode:

ImageIO: PNG invalid PNG file: iDOT doesn't point to valid IDAT chunk

The image still displays and looks correct. Also this only happens when I run the app on an iPad (3rd generation). My iPhone 4 doesn't display this message.

My first thought was that it was caused by a ~ character in the filename (I've added the ~ipad tag to the filename). However, removing the ~ character doesn't have any effect.

I've done a google search but I only get 3 results. 2 of them are in Chinese that doesn't seem to be translated well by Google's translater. The other results seems to be someone with the same issue as me, but no responses to his post.

Answer 1

Had the same problem. Solution: use "color sync utility" which is a standard program, you can load from launchpad. Open the png file and save it with the utility.