png file exports - disable metadata?

classic Classic list List threaded Threaded
2 messages Options
Reply | Threaded
Open this post in threaded view
|

png file exports - disable metadata?

Developers mailing list
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?
_______________________________________________
gimp-developer-list mailing list
List address:    [hidden email]
List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list
List archives:   https://mail.gnome.org/archives/gimp-developer-list
Reply | Threaded
Open this post in threaded view
|

Re: png file exports - disable metadata?

Ofnuts-2
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


_______________________________________________
gimp-developer-list mailing list
List address:    [hidden email]
List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list
List archives:   https://mail.gnome.org/archives/gimp-developer-list