Python scripts for simple image transformations

Handy when working with icons, like this one:

(img.png)

Setup

Make sure python/python3 and pip/pip3 are installed and install Pillow

$ pip install Pillow

or use pip3.

Changes the opacity of the image multiplying the alpha channel of each pixel for the specified value.

Example:

$ python opacity.py img.png 0.4

(img_opacity_0.4.png)

Changes the color of the image to the specified RGB value keeping the alpha unchanged.

Example:

$ python tint.py img_opacity_0.4.png 10 20 200

(img_opacity_0.4_tinted.png)

Transforms the colors of the image to their negative, alpha unchanged.

Example:

$ python negative.py img_opacity_0.4_tinted.png

(img_opacity_0.4_tinted_negative.png)

Inverts the opacity of an image.

Examples:

$ python invert.py img_opacity_0.4_tinted.png

(img_opacity_0.4_tinted_inverted.png)

$ python invert.py img.png

(img_inverted.png)

Converts the white pixels of an image to transparent ones

Example:

(img_white.png)

$ python white_to_transparent.py img_white.png

(img_white_transp.png)

You can process more images at the same time

Examples:

Change the opacity of 'img.png' and 'img2.png'

$ python opacity.py img.png img2.png 0.4

Change the opacity of all the png files in the 'icons' folder

$ python opacity.py icons/*.png 0.4