Png Image Did Not Start With Ihdr. For information about png see the png home page. It supports indexed palette based 24 bit rgb or 32 bit rgba rgb with a fourth alpha channel color images.
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A decoder need not pay attention to sbit. The output of the code in console is. I have written a code in swift to read the same png file and print the bytes which does not give me an ihdr with length equal to 13 bytes from the first 4 bytes of the chunk after the png signature.
The output of the code in console is.
On a 32 bit machine e g go playground int is int32 in retrospect i should have probably used int32 in the struct or come to think of it uint32 could have been a better choice. 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. The png format is widely used especially on the web for saving images. The png spec requires all png files to have ihdr as the first chunk.