![]() Then, use PCRT to fix the CRC errors (tool at ) Reload the image in the hex editor and scroll through you will see that all IADT is corrected to IDAT and INED is corrected to IEND. Let’s fix it using the below syntax: $ sed -i 's/IADT/IDAT/g' new_file $ sed -i 's/INED/IEND/g' new_file When I scroll through the hex file of the new_file, I noticed that IDAT is written as IADT and IEND is written as INED. File Size : 44 KiB File Modification Date/Time : 2021:04:05 21:43:28-04:00 File Access Date/Time : 2021:04:05 21:43:28-04:00 File Inode Change Date/Time : 2021:04:05 21:43:28-04:00 File Permissions : rw-r-r- File Type : PNG File Type Extension : png MIME Type : image/png Image Width : 512 Image Height : 308 Bit Depth : 8 Color Type : RGB with Alpha Compression : Deflate/Inflate Filter : Adaptive Interlace : Noninterlaced Warning : Truncated PNG image Image Size : 512x308 Megapixels : 0.158 $ pngcheck -v new_file File: new_file (45357 bytes) chunk IHDR at offset 0x0000c, length 13 512 x 308 image, 32-bit RGB+alpha, non-interlaced CRC error in chunk IHDR (computed 5a7b8bdc, expected 5a9b8bdc) ERRORS DETECTED in new_fileįrom these two tools, we know that the new_file is truncated and there’s a crc error. $ exiftool new_file ExifTool Version Number : 12.16 File Name : new_file Directory. Let’s use a pngcheck and exiftool to see what is wrong with the new_file. ![]() ![]() $ file new_file new_file: PNG image data, 512 x 308, 8-bit/color RGBA, non-interlaced
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