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png file exports - disable metadata?

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png file exports - disable metadata? Paul Jewell via gimp-developer-list 15 May 22:03
  png file exports - disable metadata? Ofnuts 19 May 11:51
Paul Jewell via gimp-developer-list
2019-05-15 22:03:32 UTC (over 5 years ago)

png file exports - disable metadata?

Hi All, I am wondering about a curious event I am seeing related to exporting PNG images from Gimp either through the usual interface, or via a script like so:

pdb.file_png_save2(gimp.image_list()[0], gimp.image_list()[0].layers[0], '/tmp/test1.png', '/tmp/test1.png', 0, 0, 0, 0, 0, 0, 0, 0, 0) pdb.file_png_save2(gimp.image_list()[0], gimp.image_list()[0].layers[0], '/tmp/test2.png', '/tmp/test2.png', 0, 0, 0, 0, 0, 0, 0, 0, 0)

It seems that exporting these two pngs, some different data is written because they have a different sha1sum. (I would guess timestamp, but I disabled this with the plugin option as shown) This weirdness does not seem to happen with other file formats like webp, raw, etc. Is there any way to disable the writing of this extra data?

Ofnuts
2019-05-19 11:51:02 UTC (over 5 years ago)

png file exports - disable metadata?

On 5/16/19 12:03 AM, Paul Jewell via gimp-developer-list wrote:

Hi All, I am wondering about a curious event I am seeing related to exporting PNG images from Gimp either through the usual interface, or via a script like so:

pdb.file_png_save2(gimp.image_list()[0], gimp.image_list()[0].layers[0], '/tmp/test1.png', '/tmp/test1.png', 0, 0, 0, 0, 0, 0, 0, 0, 0) pdb.file_png_save2(gimp.image_list()[0], gimp.image_list()[0].layers[0], '/tmp/test2.png', '/tmp/test2.png', 0, 0, 0, 0, 0, 0, 0, 0, 0)

It seems that exporting these two pngs, some different data is written because they have a different sha1sum. (I would guess timestamp, but I disabled this with the plugin option as shown) This weirdness does not seem to happen with other file formats like webp, raw, etc. Is there any way to disable the writing of this extra data?

Can't reproduce. Saving the same PNG twice gives two files with identical hashes even when saving:

* background color

* gamma

* layer offset

* resolution

* comment

the comment