Walk a CSV to generate a series of placeholder PNG files of various sizes.

templates.py

#!/usr/bin/env python3 

#
# take a CSV of template image sizes, and make template image placeholders
# using the ImageMagick command line for each entry in the table
#

import subprocess
import csv
import os

def qx(cmd, verbose=False):
    '''Just like qx// or backticks operator from Perl, running the command
    and returning the STDOUT results as a string.  Optional echo of the
    command issued first.
    '''
    if verbose: print(cmd)
    run = subprocess.Popen(cmd, #shell=True,
                           stdout=subprocess.PIPE,
                           stderr=subprocess.PIPE)
    (out, err) = run.communicate()
    if run.returncode != 0:
        return 'Return code: %d' % run.returncode
    return out

if __name__ == '__main__':

    folder = './templates'
    magick = 'magick'
    #magick = 'convert'
    requests = 'templates.txt'
    font = 'Arial'
    #font = 'Ubuntu-Sans'

    if not os.path.exists(folder):
        os.mkdir(folder)

    line = 0
    with open(requests) as f:
        data = csv.reader(f)
        for row in data:
            line += 1
            if not len(row):
                continue
            if row[0].startswith('#'):
                continue

            # x, y, name, description
            row = [ cell.strip() for cell in row ]
            (x, y) = (int(row[0]), int(row[1]))
            name = row[2]

            output = qx( [
                magick,
                '-size', f'{x}x{y}', 'xc:black',
                '-font', font, '-pointsize', '24', '-fill', '#c0c0c0',
                '-gravity', 'northwest',
                '-annotate', '+10+10',
                f' {x}x{y} {name}',
                os.path.join(folder, f'{name}.png'),
                ], True)

            print(output)

templates.txt

# Steamworks Store Assets

# store page assets
 460, 215, store_capsule_header,    just game logo and artwork
 616, 353, store_capsule_main,      just game logo and artwork
 231,  87, store_capsule_small,     just game logo and artwork
 374, 448, store_capsule_vertical,  just game logo and artwork
1438, 810, store_page_background,   subtle artwork, not too bright

# library assets
 600, 900, library_capsule,         just game logo and artwork
3840,1240, library_hero,            just game artwork, no logo
1280, 720, library_logo,            just logo with transparent background

# community assets
 184, 184, community_icon,          small logo or icon
  32,  32, client_icon,             .ico format multi-size 32x32 min

# event assets
 800, 450, event_cover,             artwork and marketing copy for announcement
1920, 622, event_header,            special safe zone bleed/cropping rules

# bundle assets (optional)

# achievement assets
 256, 256, ach_awarded,             artwork for an awarded achievement (colorful)
 256, 256, ach_unawarded,           art for a locked but known achievement (gray)