[Gimp-developer] Asking for help/collaboration in nonprofit mini-project around covid-19

Thank you Ofnuts, Ken and Pat for your quick responses.
I can take advantage of something from each of your contributions.
I don't know about ImageMagic, but the shell scripting is one of my best. I
have reading and work for a few days.
If I get everything to work I will notify in this forum, in case someone
wants to use or share it.

Till then kind regards

Un cordial saludo,

*Pedro Cáliz*

El sáb., 2 may. 2020 a las 4:45, <gimp-developer-list-request gnome org>

Message: 2
Date: Fri, 1 May 2020 23:21:18 +0200
From: Ofnuts <ofnuts gmx com>
Subject: Re: [Gimp-developer] Asking for help/collaboration in
        nonprofit mini-project around covid-19
Message-ID: <3e3b9872-ef48-ddb9-67f8-b50cef2643fd gmx com>

Typically done with ImageMagick: https://imagemagick.org/index.php

Some features:



Message: 4
Date: Sat, 2 May 2020 02:24:11 +0100
From: Ken Moffat <zarniwhoop ntlworld com>
Subject: Re: [Gimp-developer] Asking for help/collaboration in
        nonprofit mini-project around covid-19
Message-ID: <20200502012411.GA10536@llamedos.localdomain>
Content-Type: text/plain; charset=utf-8

On Fri, May 01, 2020 at 11:21:18PM +0200, Ofnuts wrote:

Probably getting a bit OT for gimp-dev, but I'll reply here anyway
this time.

For the rest, typically done with shell script(s) from bash since
all you are doing is invoking programs with some options, e.g. 'cp'
to move files from 'A' to 'C' IFF (if and only if) the modifications
to create the file in B did not end in failure.

Obviously, set aside some work space to play around with a *copy*
of a file and then when the modifications seem to work on that file,
try a copy of a different file.

I've done the resizing in the past but I've never tried adding text
on top, or borders.

But the fun part will be downloading everything from the original
directory, and then wiping out everything that is there, without
losing anything that comes in after you have started the download.

Perhaps list everything currently at the directory, wget each item
in turn checking for no errors (e.g. full disk, non-responsive
external server) make a backup (did I mention the aggravation caused
by losing something someone sent you?) and only then rm the file
from the original.

Or do the rm at the end, but perhaps keeping a separate file of those
jpegs you have successfully downloaded and adding the details to that
file after tou have successfully downloaded a file.

For IM there are lots of posts online.

I've in the past used it to resize a batch of photos, the salient
points were (from a bash script which was modifying the original

for F in $*; do
        echo "Processing $F" # I like scripts to keep me informed

        # confirm it really is a jpeg, and find its dimensions
        DIMENSIONS=$(identify $F | grep JPEG | awk '{ print $3}')
        if [ -z "$DIMENSIONS" ]; then
                echo "ERROR: $F seems not to be a jpeg"
                exit 1
        WIDTH=$(echo $DIMENSIONS | cut -d 'x' -f1)
        DEPTH=$(echo $DIMENSIONS | cut -d 'x' -f2)

        if [ $WIDTH -gt 2048 ] || [ $DEPTH -gt 2048 ]; then
                mogrify -resize 2048x2048 $F
                echo "$F not resized, is only $WIDTH x $DEPTH"

As with all old scripts, or hunks you find online, replace active
commands by a comment of what will happen when doing it the first
time, so in this case comment out the mogrify and add e.g.
                echo "will resize usign mogrify"
or alternatively for a simple command like that just try the command
on a copied jpeg to confirm it, and any other options you add, do
the right think (then use 'identify' and 'display' afterwards).

You might also need to consider how much upload space you have, and
bandwidth for people viewing, if this becomes popular.  I'm guessing
a jpeg of max dimension 2048 will typically be less than 2 MB, but

Also, you'll want to review the results at full size, even if most
people have screens which are smaller than 2048x2048.

                 See You Later, Holy Poppadom!
                    -- Red Dwarf, The Promised Land


Message: 5
Date: Fri, 1 May 2020 21:45:17 -0500
From: Pat David <patdavid gmail com>
To: Ken Moffat <zarniwhoop ntlworld com>
Subject: Re: [Gimp-developer] Asking for help/collaboration in
        nonprofit mini-project around covid-19
k0DaBH0NabHGqXBZzhQ mail gmail com>
Content-Type: text/plain; charset="UTF-8"

Also, not sure if it?s helpful but we wrote a simple imagemagick command
for something similar to what you?re asking for:


Might have some luck with other ideas there for what you?re trying to do
(or the gimp-user list).


On Fri, May 1, 2020 at 8:31 PM Ken Moffat via gimp-developer-list <
gimp-developer-list gnome org> wrote:


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