![]() ![]() (PNG and EXIF are still 29 # written after IDAT.) As of version 11.63, this strategy is 30 # applied to all text chunks (tEXt, zTXt and iTXt). As of version 11.58, ExifTool uses a 2-pass 27 # writing algorithm to allow it to be compatible with XMP after 28 # IDAT while writing it before IDAT. 22 # 23 # Although XMP is allowed after the IDAT chunk according to the 24 # PNG specifiction, some apps (Apple Spotlight and Preview for 25 # OS X 10.8.5 and Adobe Photoshop CC 14.0) ignore it unless it 26 # comes before IDAT. Harvey Added write support 9 # 10 # References: 1) 11 # 2) 12 # 3) 13 # 4) 14 # 5) 15 # 6) 16 # 17 # Notes: Writing meta information in PNG images is a pain in the butt 18 # for a number of reasons: One biggie is that you have to 19 # decompress then decode the ASCII/hex profile information before 20 # you can edit it, then you have to ASCII/hex-encode, recompress 21 # and calculate a CRC before you can write it out again. Harvey Added MNG and JNG support 8 # - P. ![]() As a special service "Fossies" has tried to format the requested source page into HTML format using (guessed) Perl source code syntax highlighting (style: standard) with prefixed line numbers and code folding option.Īlternatively you can here view or download the uninterpreted source code file.įor more information about "PNG.pm" see the Fossies "Dox" file reference documentation and the last Fossies "Diffs" side-by-side code changes report: 12.69_vs_12.70.ġ #- 2 # File: PNG.pm 3 # 4 # Description: Read and write PNG meta information 5 # 6 # Revisions: - P.
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