first commit

.gitignore

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+.venv/
+.vscode/
+Pipfile.lock

Pipfile

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+[[source]]
+name = "pypi"
+url = "https://pypi.org/simple"
+verify_ssl = true
+
+[dev-packages]
+pylint = "*"
+flake8 = "*"
+autopep8 = "*"
+
+[packages]
+pillow = "*"
+
+[requires]
+python_version = "3.8"

README.md

@@ -1,2 +1,16 @@
 # image-resize
 Change size of image file
+
+## Usage
+usage: image-resize [-h] (--width pix | --height pix) [--up] imagefile
+
+Resize image file.
+
+positional arguments:
+  imagefile             image file name
+
+optional arguments:
+  -h, --help            show this help message and exit
+  --width pix, -w pix   witdh(pixel)
+  --height pix, -H pix  height(pixel)
+  --up, -u              accept scale up

image-resize.py

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+#!/usr/bin/env python
+
+import sys
+
+
+def resize(args):
+    from PIL import Image
+
+    try:    # 画像ファイルを読み込む
+        im = Image.open(args.imagefile)
+    except IOError:
+        print('Error: image file not found.', file=sys.stderr)
+        return 1
+
+    try:
+        oriantation = get_exif(im)['Orientation']
+    except KeyError:
+        oriantation = 1
+
+    org_width, org_height = im.size
+    res_width, res_height = (0, 0)
+
+    if args.width and args.width > 0:
+        if args.width == org_width:
+            resize = False
+        elif args.up:
+            resize = True
+        elif args.width < org_width:
+            resize = True
+        else:
+            print(
+                f'Error: image width is less than {args.width} pixels.',
+                file=sys.stderr)
+            return 1
+        if resize:
+            res_width = args.width
+            res_height = (int)(org_height * args.width / org_width)
+
+    elif args.height and args.height > 0:
+        if args.height == org_height:
+            resize = False
+        elif args.up:
+            resize = True
+        elif args.height < org_height:
+            resize = True
+        else:
+            resize = False
+            print(
+                f'Error: image height is less than {args.height} pixels.',
+                file=sys.stderr)
+            return 1
+        if resize:
+            res_width = (int)(org_width * args.height / org_height)
+            res_height = args.height
+
+    else:
+        print(f'Error: [width | height] shuld be > 0', file=sys.stderr)
+        return 1
+
+    if resize:
+        res_im = im.resize((res_width, res_height))
+        if oriantation > 1:
+            trans = (0, 0, 0, 3, 1, 5, 4, 6, 2)
+            res_im = res_im.transpose(trans[oriantation])
+        res_im.save(args.imagefile)
+
+    return 0
+
+
+def get_exif(im):
+    from PIL.ExifTags import TAGS
+
+    exif = im._getexif()
+    exif_table = {}
+    if exif:
+        for tag_id, value in exif.items():
+            tag = TAGS.get(tag_id, tag_id)
+            exif_table[tag] = value
+
+    return exif_table
+
+
+if __name__ == '__main__':
+    import argparse as ap
+
+    parser = ap.ArgumentParser(
+        prog='image-resize', description='Resize image file.')
+    group = parser.add_mutually_exclusive_group(required=True)
+    group.add_argument('--width', '-w', metavar='pix',
+                       type=int, help='witdh(pixel)')
+    group.add_argument('--height', '-H', metavar='pix',
+                       type=int, help='height(pixel)')
+    parser.add_argument('--up', '-u', action='store_true',
+                        help='accept scale up')
+    parser.add_argument('imagefile', type=str, help='image file name')
+    args = parser.parse_args()
+
+    res = resize(args)
+    sys.exit(res)