Png Image Did Not Start With Ihdr. Png file signature. This signature indicates that the remainder of the file contains a single png image consisting of a series of chunks beginning with an ihdr chunk and ending with an iend chunk.
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In order to make much use of it you will have to be at least somewhat familiar with the internal format of png files. If we were interested in whether the image is interlaced or what compression and filtering methods it uses we would use actual values instead of nulls for the last three arguments to png get ihdr. First set image mode 16 bit.
A quick look at generate map cpp l682 png hpp l21 and image base hpp l23 suggest that similar issues may still be possible to trigger.
First set image mode 16 bit. This is an optional chunk type meaning that not all png files will specify it. Note that the png 1 0 and 1 1 specifications define only a single allowed value 0 for either the compression type or the filtering method. A decoder need not pay attention to sbit.
