Resize PNG Images While Preserving Transparency and Aspect Ratio

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https://ffmpeg-by-example.s3.amazonaws.com/yellow-flowers.png

Scale PNG images with transparent backgrounds while maintaining aspect ratio and alpha channel integrity for web graphics and design workflows.

Command Breakdown:

  • -i original.png: Specifies the input PNG image file to be processed.
  • -vf scale="160:-1": Applies scale filter to resize width to 160 pixels while automatically calculating height to preserve aspect ratio.
  • -c:v png: Sets PNG codec for output to maintain image format compatibility.
  • -pix_fmt rgba: Ensures RGBA pixel format with alpha channel for transparency preservation.

Key Point: The -pix_fmt rgba parameter is crucial as FFmpeg defaults to formats without alpha channels, which would remove transparency from your PNG images.

source: reddit

ffmpeg -i original.png -vf scale="160:-1" -c:v png -pix_fmt rgba scaled.png