mirror of
https://github.com/kuhyx/testsAndMisc.git
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98 lines
2.6 KiB
Bash
Executable File
98 lines
2.6 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Convert an image to a specified resolution
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# Default resolution: 320x240
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# Usage: image_to_resolution.sh <input_image> [resolution] [output_image]
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set -euo pipefail
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# Default resolution
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DEFAULT_RESOLUTION="320x240"
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# Function to display usage
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usage() {
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cat << EOF
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Usage: $0 <input_image> [resolution] [output_image]
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Arguments:
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input_image Path to the input image file (required)
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resolution Target resolution in WIDTHxHEIGHT format (default: ${DEFAULT_RESOLUTION})
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output_image Path to the output image file (default: <input>_<resolution>.<ext>)
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Examples:
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$0 photo.jpg
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$0 photo.jpg 640x480
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$0 photo.jpg 1920x1080 output.jpg
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$0 image.png 320x240 resized.png
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Note: Requires ImageMagick (convert command)
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EOF
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exit 1
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}
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# Check if ImageMagick is installed
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if ! command -v convert &> /dev/null; then
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echo "Error: ImageMagick (convert) is not installed."
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echo "Install it with:"
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echo " Arch Linux: sudo pacman -S imagemagick"
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echo " Ubuntu/Debian: sudo apt install imagemagick"
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exit 1
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fi
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# Parse arguments
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if [[ $# -lt 1 ]]; then
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echo "Error: Missing required argument <input_image>"
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usage
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fi
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INPUT_IMAGE="$1"
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RESOLUTION="${2:-${DEFAULT_RESOLUTION}}"
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OUTPUT_IMAGE="${3:-}"
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# Validate input image exists
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if [[ ! -f ${INPUT_IMAGE} ]]; then
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echo "Error: Input image '${INPUT_IMAGE}' does not exist."
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exit 1
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fi
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# Validate resolution format (WIDTHxHEIGHT)
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if [[ ! ${RESOLUTION} =~ ^[0-9]+x[0-9]+$ ]]; then
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echo "Error: Invalid resolution format '${RESOLUTION}'"
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echo "Expected format: WIDTHxHEIGHT (e.g., 320x240, 1920x1080)"
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exit 1
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fi
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# Generate output filename if not provided
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if [[ -z ${OUTPUT_IMAGE} ]]; then
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# Extract filename without extension and extension
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BASENAME=$(basename "${INPUT_IMAGE}")
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FILENAME="${BASENAME%.*}"
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EXTENSION="${BASENAME##*.}"
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# If no extension (single name file), default to jpg
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if [[ ${FILENAME} == "${EXTENSION}" ]]; then
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EXTENSION="jpg"
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fi
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# Create output filename with resolution suffix
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DIRNAME=$(dirname "${INPUT_IMAGE}")
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OUTPUT_IMAGE="${DIRNAME}/${FILENAME}_${RESOLUTION}.${EXTENSION}"
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fi
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# Perform the conversion
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echo "Converting '${INPUT_IMAGE}' to ${RESOLUTION}..."
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echo "Output will be saved to: ${OUTPUT_IMAGE}"
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if convert "${INPUT_IMAGE}" -resize "${RESOLUTION}!" "${OUTPUT_IMAGE}"; then
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echo "✓ Successfully converted image to ${RESOLUTION}"
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echo "Output: ${OUTPUT_IMAGE}"
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# Show file sizes
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INPUT_SIZE=$(du -h "${INPUT_IMAGE}" | cut -f1)
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OUTPUT_SIZE=$(du -h "${OUTPUT_IMAGE}" | cut -f1)
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echo "Input size: ${INPUT_SIZE}"
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echo "Output size: ${OUTPUT_SIZE}"
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else
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echo "✗ Error: Conversion failed"
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exit 1
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fi
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