-itxt switch does not insert iTXt chunk. Furthermore, manual does not explain the parameters used by the switch.
-text switch does not add tEXt chunk to output, even though it says 'Added a tEXt chunk'. See attachment pcp.
-zitxt does not add zTXt chunk. Unlike -text switch, the activity wasn't even reported.
-ztxt does not add zTXt chunk to output, even though it says 'Added a zTXt chunk'.
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