This script processes a sequence of TIF images by cropping each image to a vertical strip from the center for use in slitscan image creation

stripe.sh

#!/bin/bash

# This script processes a sequence of TIF images by cropping each image to a vertical strip from the center. Here's a breakdown:

# 1. It takes images from an input directory ("frames-try1") and saves the cropped versions to an output directory ("frames-03-trial").
# 2. The script extracts a vertical strip with a width of 105 pixels, centered in each image.
# 3. It uses ffprobe to determine the dimensions of the first image, calculates the center, and then uses ffmpeg to crop all images in the sequence.

# If you want to use this script, you might need to edit:
# - `INPUT_DIR` and `OUTPUT_DIR` paths to match your folder names
# - `STRIP_WIDTH` to change how wide the vertical strip should be
# - The file format if you're not using TIF files
# - The filename pattern in the ffmpeg command if your files aren't numbered as %06d.tif (6-digit numbers)

# The script is designed to maintain the vertical height of the images while only keeping a centered vertical strip.




# Input and output directories
INPUT_DIR="frames-try1"
OUTPUT_DIR="frames-03-trial"

# Strip width configuration (can be changed to any number of pixels)
STRIP_WIDTH=105

# Create output directory if it doesn't exist
mkdir -p "$OUTPUT_DIR"

# Check if the input directory exists
if [ ! -d "$INPUT_DIR" ]; then
    echo "Error: Input directory '$INPUT_DIR' not found."
    exit 1
fi

echo "Processing TIF sequence from '$INPUT_DIR' to '$OUTPUT_DIR'..."
echo "Strip width: $STRIP_WIDTH pixels"

# Change to input directory
cd "$INPUT_DIR"

# Find the first TIF file to get dimensions
first_file=$(find . -name "*.tif" | sort | head -n 1)

if [ -z "$first_file" ]; then
    echo "Error: No TIF files found in '$INPUT_DIR'"
    exit 1
fi

# Get image dimensions using ffprobe
width=$(ffprobe -v error -select_streams v:0 -show_entries stream=width -of csv=p=0 "$first_file")
height=$(ffprobe -v error -select_streams v:0 -show_entries stream=height -of csv=p=0 "$first_file")

if [ -z "$width" ] || [ -z "$height" ]; then
    echo "Error: Could not determine dimensions for $first_file"
    exit 1
fi

# Calculate center and adjust for strip width to keep it centered
center_x=$((width / 2))
strip_x=$((center_x - STRIP_WIDTH / 2))

echo "Image dimensions: ${width}x${height}"
echo "Center column: $center_x, Strip starting at: $strip_x, Width: $STRIP_WIDTH"

# Return to original directory
cd ..

# Process the entire sequence in one command
ffmpeg -i "$INPUT_DIR/%06d.tif" \
       -vf "crop=$STRIP_WIDTH:$height:$strip_x:0" \
       "$OUTPUT_DIR/%06d.tif"

echo "Completed processing sequence."s