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Negate numeric items, or flip the letter case of every item.

Colour every item with a rotating palette (ANSI escape codes or hex prefixes).

Fold long items onto indented continuation lines.

Annotate items with the error message on the matching line.

Draw the list as a PNG picture.

Render the list as a PDF document.

Remove a horizontal or vertical band from a PNG and join the two sides.

Place the image in the middle of a larger canvas.

Pad the image with empty space until it is square.

Mask the image into a five-point star.

Mask the image into a wavy band.

Shear the image along the horizontal or vertical axis.

Offset every pixel, optionally wrapping around the edges.

Scale the whole image to fit inside a rectangle.

Stretch the image to an exact width and height.

Stamp a semi-transparent watermark onto a PNG.

Crop a fixed border off every side.

Flatten transparency onto a solid background colour.

Make the background colour transparent.

Delete one colour from a PNG.

Exchange two colours, or replace one with another.

Adjust brightness, contrast, saturation or hue.

Scale the whole image's opacity.

Read the colour of a pixel, the average colour or the dominant colours.