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added image resizing to the CLI

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fixes gh-18
This commit is contained in:
András Veres-Szentkirályi 2019-01-22 14:41:44 +01:00
parent 99d8709053
commit 4b95f8b5c3
1 changed files with 32 additions and 2 deletions
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34
pysstv/__main__.py
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@ -1,6 +1,6 @@
#!/usr/bin/env python
from __future__ import print_function
from __future__ import print_function, division
from PIL import Image
from argparse import ArgumentParser
from sys import stderr
@ -30,10 +30,40 @@ def main():
help='add FSKID at the end')
parser.add_argument('--chan', dest='chan', type=int,
help='number of channels (default: mono)')
parser.add_argument('--resize', dest='resize', action='store_true',
help='resize the image to the correct size')
parser.add_argument('--keep-aspect-ratio', dest='keep_aspect_ratio', action='store_true',
help='keep the original aspect ratio when resizing (and cut off excess pixels)')
parser.add_argument('--resample', dest='resample', default='lanczos',
choices=('nearest', 'bicubic', 'lanczos'),
help='which resampling filter to use for resizing (see Pillow documentation)')
args = parser.parse_args()
image = Image.open(args.img_file)
mode = module_map[args.mode]
if not all(i >= m for i, m in zip(image.size, (mode.WIDTH, mode.HEIGHT))):
if args.resize and any(i != m for i, m in zip(image.size, (mode.WIDTH, mode.HEIGHT))):
resample = getattr(Image, args.resample.upper())
if args.keep_aspect_ratio:
orig_ratio = image.width / image.height
mode_ratio = mode.WIDTH / mode.HEIGHT
crop = orig_ratio != mode_ratio
else:
crop = False
if crop:
if orig_ratio < mode_ratio:
w = mode.WIDTH
h = int(w / orig_ratio)
else:
h = mode.HEIGHT
w = int(orig_ratio * h)
else:
w = mode.WIDTH
h = mode.HEIGHT
image = image.resize((w, h), resample)
if crop:
x = (image.width - mode.WIDTH) / 2
y = (image.height - mode.HEIGHT) / 2
image = image.crop((x, y, mode.WIDTH + x, mode.HEIGHT + y))
elif not all(i >= m for i, m in zip(image.size, (mode.WIDTH, mode.HEIGHT))):
print(('Image must be at least {m.WIDTH} x {m.HEIGHT} pixels '
'for mode {m.__name__}').format(m=mode), file=stderr)
raise SystemExit(1)