asc-screenshot-resize

1# asc screenshot resize
2 
3Use this skill to prepare screenshots for App Store Connect. Do not rely on a hard-coded dimension table in this skill; the CLI owns the current size matrix.
4 
5## Source of truth
6 
7Always discover current accepted sizes from `asc` first:
8 
9```bash
10asc screenshots sizes --output table
11asc screenshots sizes --all --output table
12```
13 
14For local validation before upload:
15 
16```bash
17asc screenshots validate --path "./screenshots/iphone" --device-type "IPHONE_65" --output table
18asc screenshots validate --path "./screenshots/ipad" --device-type "IPAD_PRO_3GEN_129" --output table
19```
20 
21Common current device-type anchors:
22 
23- `IPHONE_65` for the common 6.5-inch iPhone screenshot set.
24- `IPAD_PRO_3GEN_129` for the common 12.9/13-inch iPad screenshot set.
25 
26Run `asc screenshots sizes --all` when targeting other display types such as 6.9-inch iPhone, Apple TV, Mac, Vision Pro, iMessage, or Watch.
27 
28## Workflow
29 
30### 1. Sanitize filenames
31 
32macOS screenshots can contain hidden Unicode spaces that make tools fail with "not a valid file". Sanitize before batch work:
33 
34```bash
35python3 -c "
36import os
37for f in os.listdir('.'):
38    clean = f.replace('\u202f', ' ')
39    if f != clean:
40        os.rename(f, clean)
41        print(f'Renamed: {clean}')
42"
43```
44 
45### 2. Inspect dimensions and metadata
46 
47```bash
48sips -g pixelWidth -g pixelHeight screenshot.png
49sips -g hasAlpha -g space screenshot.png
50```
51…