How to annotate text on image files?

Shell Programming and Scripting
1

Dear Sir,
The problem description as follows
I have a folder named abc with files of different extensions such as:

bcsu.txt
hsdk.prot
ajia.sh
sai.hm
abcd_1213_saj.png

I am supposed to write a bash script which reads all the .png files
and read the 6th7th8th9th(word/numerals) here it is 1213
and add it on the bottom of the same image file.So that when we open the image file
abcd_1213_saj.png , we could see the 1213 on the bottom line
This script should read all the png files in the defined folder do the same task.

2

Please tell us about .png files . Are they a simple text format suitable for processing in Shell Tools or some other format which needs special programming?

3

a simple text format is enough....no special effects or programming is required

4

In that case it can't be Portable Network Graphics format (a format which is unsuitable for editing with test-based tools).

You probably need a script someting like this:

#!/bin/bash
cd abc
ls -1d *\.png | while read filename
do
      # make sure it is a proper file
      if [ -f "${filename}" ]
      then
           numerals=$(echo ${filename}|cut -c6-9)
           # For testing, work on a copy of each file
           # Copy the file
           cp -p "${filename}" "${filename}.sav"
           # Append the text 
           echo "${numerals}" >> "${filename.sav}"
     fi
done
5

its not reading the 6th to 9th numerals......

---------- Post updated 07-26-12 at 03:08 AM ---------- Previous update was 07-25-12 at 11:53 PM ----------

#!/bin/bash
FILES=/home/balnair/transfer/Images/test/*
for f in $FILES
do
  echo "Processing $f file....."
 
         numerals=$(echo ${f}|cut -c56-59)
  
  
        echo "$numerals" 
  
 
convert $FILES -font courier -fill white -pointsize 20 -annotate +50+50 '$numerals'  $numerals.jpg

done

There are some issues facing in the above script

1.script could able to get the numeras , but unable to annotate on the image
2.multiple files are being wriiten for a particular png files

what could be done?...wht shoud be the modification in this script?

Thanks in advance

6

I'm not sure what you mean.

Could you give an example of what's happening?