resize-images-hd

name	resize-images-hd
description	Resize all PNG images in a folder recursively to 800% using nearest-neighbor scaling (pixel-perfect, no blurring). Outputs each image as the same filename with -hd.png suffix. Ideal for generating HD preview versions of pixel art / icon assets.

Resize Images HD — Batch 8× PNG Upscale

Recursively resize all PNG files in a target folder to 800% of their original size using ImageMagick's nearest-neighbor filter (no anti-aliasing or blurring). Each output file is named {original-name}-hd.png and placed alongside its source.

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Step 1 — Confirm Target Folder

Ask the user which folder to process if not already specified. The folder must exist in the workspace.

Example folders in this project:

• DEV/IMAGES — development/reference screenshots

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Step 2 — Preview File Count

Before processing, count the files that will be affected:

find /path/to/folder -name "*.png" ! -name "*-hd.png" | wc -l

Report the count to the user before proceeding.

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Step 3 — Run the Batch Resize

Use ImageMagick convert with -filter point -resize 800% to upscale without blurring. Skip any files already ending in -hd.png to avoid double-processing.

find /path/to/folder -name "*.png" ! -name "*-hd.png" | while read f; do
    dir=$(dirname "$f")
    base=$(basename "$f" .png)
    convert "$f" -filter point -resize 800% "$dir/${base}-hd.png"
done && echo "Done"

Key flags:

• -filter point — nearest-neighbor (pixel-perfect, ideal for pixel art and icons)
• -resize 800% — 8× enlargement
• ! -name "*-hd.png" — prevents reprocessing already-generated HD files

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Step 4 — Verify Output

Spot-check a few output files to confirm they were created at the expected size:

find /path/to/folder -name "*-hd.png" | head -5 | while read f; do
    identify -format "%f: %wx%h\n" "$f"
done

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Notes

• To use a different scale factor, replace 800% with e.g. 400% (4×) or 1600% (16×).
• To resize in-place (overwrite originals) instead of creating -hd copies, remove the suffix and write to the same path — but confirm with the user first as this is destructive.
• For non-pixel-art images where smoothing is acceptable, omit -filter point to use ImageMagick's default Lanczos filter.
• Requires imagemagick to be installed (convert command available).