png metadata
Posted: Wed Aug 08, 2018 3:26 pm
Would be nice if we can add text to a png file to describe the default or custom properties. The libpng PB uses supports it.
PNG EXIF metadata has now been standardised. EXIF has always been standardised for JPEG and TIFF (though not JPEG2000).
One way to implement it would be by extending LoadImage() and SaveImage() with a pointer to an EXIF data structure:
Code: Select all
Structure NativePBExifStructure
; standard EXIF fields
EndStructure
fn.s = "C:\my-diagram.png"
img = LoadImage(#PB_Any,fn,@exif.NativePBExifStructure)
exif\DateTimeOriginal = Date()
SaveImage(img,fn,#PB_ImagePlugin_PNG,flags,depth,@exif)
Code: Select all
ReadImageEXIFData(filename,@exif.NativePBExifStructure)
WriteImageEXIFData(filename,@exif.NativePBExifStructure)