Question

#!/bin/bash

dir="/posix/path/to/folder"
cd "$dir"

color1 = "#816c51"
color2 = "#5a4a3b"
color3 = "#1c110f"

for file in *.tiff
do
    base=${file%*.tif}
    convert -unsharp 5 "$base" "$base.ppm"
    convert -opaque white -fill white -fuzz 10% "$base.ppm" "${base}_step1.tif"
    convert -fuzz 5% -fill "$color1" -opaque "$color1" "${base}_step1.tif" "${base}_step2.tif"
    convert -fuzz 1.5% -fill "$color1" -opaque "$color2" "${base}_step2.tif" "${base}_step3.tif"
    convert -fuzz 12% -fill "black" -opaque "$color3" "${base}_step3.tif" "${base}_step4.tif"
    convert "${base}_step4.tif" "${base}_final.tif"
done

I get a couple of error:

convert: unable to open image ...
convert: missing an image filename
test.sh: line 6: color1: command not found

I’d really appreciate some help! Thanks!

Answer 1

I’m a bit unclear on what this is trying to do (I don’t have much experience with ImageMagick), but from a Bash standpoint, I can tell you that this bit:

for file in *.tiff
do
    base=${file%*.tif}

does not make sense: it tries to strip off a final .tif (one F) from a file-name that ends in .tiff (two F’s). You presumably meant either this:

for file in *.tiff
do
    base="${file%.tiff}"

(which strips off the final .tiff) or this:

for file in *.tif
do
    base="${file%.tif}"

(which finds files ending in .tif); or, perhaps, this:

for file in *.tiff *.tif
do
    base="${file%.tiff}"
    base="${base%.tif}"

(which handles both cases).

You also probably want to explicitly check for the case that "$base" is '*' (which will happen, for example, if you try to use *.tif in a directory that doesn’t contain any files matching that name).