resize-images

Name: resize-images
Author: AlpacaLabsLLC

260stars54forks

How to install resize-images?

alpacalabsllc/skills-for-architects/resize-images

$npx -y skills add AlpacaLabsLLC/skills-for-architects --skill resize-images

Installs into the current project.

Summary

Batch-resize images for web (WebP at 1920/1200/400px), social (center-cropped for Instagram, Twitter/X, LinkedIn), slides (JPEG at 1024×768 and 1920×1080), and print (300 DPI JPEG at ARCH A/B/C). Use when the user asks to "resize images", prepare images for web, social, slides, o

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SKILL.md

1	# /resize-images — Image Resizer for Web, Social, and Print
2
3	Resize project photos and renders for web publishing, social media, and print layouts. Always asks the user for the source folder before doing anything. Outputs resized copies into clearly named subfolders — originals are never modified.
4
5	## Step 1: Ask for the source folder
6
7	Before doing anything else, ask:
8
9	> "Which folder contains the images you'd like to resize?"
10
11	Wait for the user's response. Accept any valid path — absolute, relative, or with `~`. Expand `~` to the user's home directory.
12
13	Then ask:
14
15	> "Which outputs do you need? (choose one or more)
16	> - Web — WebP at 1920px (hero), 1200px (standard), 400px (thumb)
17	> - Social — center-cropped WebP: Instagram square (1080×1080), Instagram portrait (1080×1350), Twitter/X (1200×675), LinkedIn (1200×627)
18	> - Slides — center-cropped JPEG: standard 4:3 (1024×768), widescreen 16:9 (1920×1080)
19	> - Print — 300 DPI JPEG at ARCH A (9×12), ARCH B (12×18), ARCH C (18×24)
20	> - All"
21
22	## Step 2: Scan the folder
23
24	List all image files in the folder (non-recursive). Supported formats: `.jpg`, `.jpeg`, `.png`, `.tif`, `.tiff`, `.webp`.
25
26	```python
27	import os, sys
28
29	folder = sys.argv[1]
30	exts = {'.jpg', '.jpeg', '.png', '.tif', '.tiff', '.webp'}
31	images = [f for f in os.listdir(folder) if os.path.splitext(f.lower())[1] in exts]
32	images.sort()
33	for img in images:
34	print(img)
35	```
36
37	Report the count: `"Found N image(s) in [folder]. Ready to resize."`
38
39	If the folder is empty or contains no supported images, tell the user and stop.
40
41	## Step 3: Check for Pillow
42
43	Run this to confirm Pillow is available:
44
45	```bash
46	python3 -c "import PIL; print('ok')" 2>/dev/null \|\| echo "missing"
47	```
48
49	If missing, tell the user:
50
51	> "Pillow isn't installed. Run `pip install Pillow` then try again."
52
53	Stop if Pillow is unavailable.
54
55	## Step 4: Create output folders
56
57	Inside the source folder, create one subfolder per requested mode:
58
59	- `resized-web/` — if web sizes were requested
60	- `resized-social/` — if social sizes were requested
61	- `resized-slides/` — if slides sizes were requested
62	- `resized-print/` — if print sizes were requested
63
64	```python
65	import os, sys
66	folder = sys.argv[1]
67	modes = sys.argv[2:] # 'web', 'social', 'slides', and/or 'print'
68	for mode in modes:
69	os.makedirs(os.path.join(folder, f"resized-{mode}"), exist_ok=True)
70	```
71
72	## Step 5: Resize images
73
74	Run this Python script via Bash, passing the folder path and modes as arguments:
75
76	```python
77	import sys
78	import os
79	from PIL import Image
80
81	folder = sys.argv[1]
82	modes = sys.argv[2:] # 'web', 'social', and/or 'print'
83
84	exts = {'.jpg', '.jpeg', '.png', '.tif', '.tiff', '.webp'}
85	images = [f for f in os.listdir(folder) if os.path.splitext(f.lower())[1] in exts]
86
87	WEB_SIZES = [
88	("hero", 1920),
89	("standard", 1200),
90	("thumb", 400),
91	]
92
93	# Social: exact crop dimensions (width, height)
94	SOCIAL_SIZES = [
95	("social-square", (1080, 1080)),
96	("social-portrait", (1080, 1350)),
97	("social-landscape", (1200, 675)),
98	("social-linkedin", (1200, 627)),
99	]
100
101	# Slides: center-crop to fill slide canvas
102	SLIDES_SIZES = [
103	("slides-standard", (1024, 768)), # 4:3
104	("slides-wide", (1920, 1080)), # 16:9
105	]
106
107	# ARCH sizes in pixels at 300 DPI: inches × 300
108	PRINT_SIZES = [
109	("arch-a", (9 * 300, 12 * 300)), # 2700 × 3600
110	("arch-b", (12 * 300, 18 * 300)), # 3600 × 5400
111	("arch-c", (18 * 300, 24 * 300)), # 5400 × 7200
112	]
113
114	def center_crop(img, target_w, target_h):
115	"""Scale to fill target dimensions, then center-crop."""
116	src_w, src_h = img.size
117	scale = max(target_w / src_w, target_h / src_h)
118	scaled_w = int(src_w * scale)
119	scaled_h = int(src_h * scale)
120	img = img.resize((scaled_w, scaled_h), Image.LANCZOS)
121	left = (scaled_w - target_w) // 2
122	top = (scaled_h - target_h) // 2
123	return img.crop((left, top, left + target_w, top + target_h))
124
125	for filename in images:
126	stem = os.path.splitext(filename)[0]
127	src_path = os.path.join(folder, filename)
128
129	try:
130	img = Image.open(src_path)
131	# Convert to RGB if needed (handles RGBA, palette, etc.)
132	if img.mode not in ("RGB", "L"):
133	img = img.convert("RGB")
134
135	print(f"Processing: {filename} ({img.width}×{img.height})")
136
137	if "web" in modes:
138	web_dir = os.path.join(folder, "resized-web")
139	for label, max_width in WEB_SIZES:
140	out_img = img.copy()
141	if out_img.width > max_width:

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resize-images

260stars54forks

View on GitHub

How to install resize-images?

alpacalabsllc/skills-for-architects/resize-images

$npx -y skills add AlpacaLabsLLC/skills-for-architects --skill resize-images

Installs into the current project.

Summary

Files · 1

View on GitHub

SKILL.md

1	# /resize-images — Image Resizer for Web, Social, and Print
2
3	Resize project photos and renders for web publishing, social media, and print layouts. Always asks the user for the source folder before doing anything. Outputs resized copies into clearly named subfolders — originals are never modified.
4
5	## Step 1: Ask for the source folder
6
7	Before doing anything else, ask:
8
9	> "Which folder contains the images you'd like to resize?"
10
11	Wait for the user's response. Accept any valid path — absolute, relative, or with `~`. Expand `~` to the user's home directory.
12
13	Then ask:
14
15	> "Which outputs do you need? (choose one or more)
16	> - Web — WebP at 1920px (hero), 1200px (standard), 400px (thumb)
17	> - Social — center-cropped WebP: Instagram square (1080×1080), Instagram portrait (1080×1350), Twitter/X (1200×675), LinkedIn (1200×627)
18	> - Slides — center-cropped JPEG: standard 4:3 (1024×768), widescreen 16:9 (1920×1080)
19	> - Print — 300 DPI JPEG at ARCH A (9×12), ARCH B (12×18), ARCH C (18×24)
20	> - All"
21
22	## Step 2: Scan the folder
23
24	List all image files in the folder (non-recursive). Supported formats: `.jpg`, `.jpeg`, `.png`, `.tif`, `.tiff`, `.webp`.
25
26	```python
27	import os, sys
28
29	folder = sys.argv[1]
30	exts = {'.jpg', '.jpeg', '.png', '.tif', '.tiff', '.webp'}
31	images = [f for f in os.listdir(folder) if os.path.splitext(f.lower())[1] in exts]
32	images.sort()
33	for img in images:
34	print(img)
35	```
36
37	Report the count: `"Found N image(s) in [folder]. Ready to resize."`
38
39	If the folder is empty or contains no supported images, tell the user and stop.
40
41	## Step 3: Check for Pillow
42
43	Run this to confirm Pillow is available:
44
45	```bash
46	python3 -c "import PIL; print('ok')" 2>/dev/null \|\| echo "missing"
47	```
48
49	If missing, tell the user:
50
51	> "Pillow isn't installed. Run `pip install Pillow` then try again."
52
53	Stop if Pillow is unavailable.
54
55	## Step 4: Create output folders
56
57	Inside the source folder, create one subfolder per requested mode:
58
59	- `resized-web/` — if web sizes were requested
60	- `resized-social/` — if social sizes were requested
61	- `resized-slides/` — if slides sizes were requested
62	- `resized-print/` — if print sizes were requested
63
64	```python
65	import os, sys
66	folder = sys.argv[1]
67	modes = sys.argv[2:] # 'web', 'social', 'slides', and/or 'print'
68	for mode in modes:
69	os.makedirs(os.path.join(folder, f"resized-{mode}"), exist_ok=True)
70	```
71
72	## Step 5: Resize images
73
74	Run this Python script via Bash, passing the folder path and modes as arguments:
75
76	```python
77	import sys
78	import os
79	from PIL import Image
80
81	folder = sys.argv[1]
82	modes = sys.argv[2:] # 'web', 'social', and/or 'print'
83
84	exts = {'.jpg', '.jpeg', '.png', '.tif', '.tiff', '.webp'}
85	images = [f for f in os.listdir(folder) if os.path.splitext(f.lower())[1] in exts]
86
87	WEB_SIZES = [
88	("hero", 1920),
89	("standard", 1200),
90	("thumb", 400),
91	]
92
93	# Social: exact crop dimensions (width, height)
94	SOCIAL_SIZES = [
95	("social-square", (1080, 1080)),
96	("social-portrait", (1080, 1350)),
97	("social-landscape", (1200, 675)),
98	("social-linkedin", (1200, 627)),
99	]
100
101	# Slides: center-crop to fill slide canvas
102	SLIDES_SIZES = [
103	("slides-standard", (1024, 768)), # 4:3
104	("slides-wide", (1920, 1080)), # 16:9
105	]
106
107	# ARCH sizes in pixels at 300 DPI: inches × 300
108	PRINT_SIZES = [
109	("arch-a", (9 * 300, 12 * 300)), # 2700 × 3600
110	("arch-b", (12 * 300, 18 * 300)), # 3600 × 5400
111	("arch-c", (18 * 300, 24 * 300)), # 5400 × 7200
112	]
113
114	def center_crop(img, target_w, target_h):
115	"""Scale to fill target dimensions, then center-crop."""
116	src_w, src_h = img.size
117	scale = max(target_w / src_w, target_h / src_h)
118	scaled_w = int(src_w * scale)
119	scaled_h = int(src_h * scale)
120	img = img.resize((scaled_w, scaled_h), Image.LANCZOS)
121	left = (scaled_w - target_w) // 2
122	top = (scaled_h - target_h) // 2
123	return img.crop((left, top, left + target_w, top + target_h))
124
125	for filename in images:
126	stem = os.path.splitext(filename)[0]
127	src_path = os.path.join(folder, filename)
128
129	try:
130	img = Image.open(src_path)
131	# Convert to RGB if needed (handles RGBA, palette, etc.)
132	if img.mode not in ("RGB", "L"):
133	img = img.convert("RGB")
134
135	print(f"Processing: {filename} ({img.width}×{img.height})")
136
137	if "web" in modes:
138	web_dir = os.path.join(folder, "resized-web")
139	for label, max_width in WEB_SIZES:
140	out_img = img.copy()
141	if out_img.width > max_width:

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