Image grayscale

Skill cxcscmu/SkillLearnBench/skills/b4-skill-creator-gemini-3-flash-preview/video-object-counting/image-grayscale

Use this skill to convert RGB images to grayscale. It provides methods using common libraries like OpenCV or PIL.From its SKILL.md

Install

npx -y skills add cxcscmu/SkillLearnBench --skill image-grayscale

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SKILL.md

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Image Grayscale Conversion Skill

This skill provides instructions for converting RGB images to grayscale.

Using OpenCV (Python)

If OpenCV is available, use the following code:

import cv2

def convert_to_grayscale(image_path):
    img = cv2.imread(image_path)
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
    cv2.imwrite(image_path, gray) # Overwrite original

Using PIL (Python)

If PIL (Pillow) is available:

from PIL import Image

def convert_to_grayscale(image_path):
    img = Image.open(image_path).convert('L')
    img.save(image_path) # Overwrite original

Using ImageMagick (CLI)

If ImageMagick is available:

mogrify -colorspace gray image.png

Verification

Confirm the image is grayscale by checking its mode or channels.

What ships with it

Read from the repository

Just SKILL.md. No reference files, no scripts.