PNG Chunks

[lorents]

Good afternoon!

Prompt how to remove certain Chunks in PNG?

[StarGeek]

If you wanted to remove the ICC_Profile, for example, you would use:

ExifTool -ICC_Profile= <DIR/FILE>

Here's the list of PNG tags.

[lorents]

Frankly speaking, I don't understand as me to attribute what to remove certain Chunks?
Prompt how to me is admissible to remove zTXt, tEXt?

[StarGeek]

If the chunk you want to remove is list on the left on the page I linked, you would take the tag name in the next column and set that equal to nothing.  Though I don't know if it would work if the third column says "N" for that chunk.

So, for "zTXt", that tag name is "CompressedText" and the command would be
ExifTool -CompressedText= <DIR/FILE>

for "tEXt", the tag name is "TextualData" and the command would be
ExifTool -TextualData= <DIR/FILE>

You could remove both with one command
ExifTool -CompressedText= -TextualData= <DIR/FILE>

Replace "<DIR/FILE>" with the directory or files you want to process.

[Phil Harvey]

The CompressedText isn't a tag as such.  It is treated as a directory of many TextualData tags, which may be deleted individually.  Or, use -png:all= to delete all writable PNG tags.

- Phil

[lorents]

thanks