Script to block out text on an image
 

This command works just fine:

convert T.jpg \( +clone -draw 'rectangle 32,20,178,55' \) -composite conv-T.jpg

It draws a black rectangle in the top left hand corner, 32px down and 20px across.

I want to use this in a script:

convert T.jpg \(+clone -draw 'rectangle $X,$Y,$XX,$YY' \) -composite conv-T.jpg

I've set the values and this is what happens

onk@XEON4 ~/TEST/PIC/PIC $ X=32
onk@XEON4 ~/TEST/PIC/PIC $ XX=178
onk@XEON4 ~/TEST/PIC/PIC $ Y=20
onk@XEON4 ~/TEST/PIC/PIC $ YY=55
convert T.jpg \(+clone -draw 'rectangle $X,$Y,$XX,$YY' \) -composite conv-T.jpg
convert: unable to open image `(+clone': No such file or directory @ error/blob.c/OpenBlob/2712.
convert: no decode delegate for this image format `' @ error/constitute.c/ReadImage/501.
convert: non-conforming drawing primitive definition `rectangle' @ error/draw.c/DrawImage/3190.
convert: unable to parse expression `)' @ error/convert.c/ConvertImageCommand/601.
onk@XEON4 ~/TEST/PIC/PIC $


Any help much appreciated

Try using echo?

Fyi, single quotes ' are taken literally. so $X means $X.
Try using double quotes? This allows variables to parse

Good idea but no this doesn't solve the problem - the problem being my lack of bash scripting knowledge.

Thanks for trying tho'.

After a bit of digging around using DuckDuckGo (https://duckduckgo.com/) I figured this line out to blur a specified rectangle on an image.

convert Test.jpg -region ${W}x${H}+${x}+${y} -blur 0x8 conv-Test.jpg

Then I wrote this script - Blur-Image.sh

#!/bin/bash
renice 19 -p $$

bold=$(tput bold)
norm=$(tput sgr0)

# default="*.mts"
# read -p "Movie To Png [$default]: " FileName
# FileName=${FileName:-$default}

read -p "Files to process (name only): " FileName

default="jpg"
read -p "Files extension (${bold}$default${norm}|png|...): " Extension
Extension=${Extension:-$default}

default="0"
read -p "Width(${bold}$default${norm}): " W
W=${W:-$default}

default="0"
read -p "Height(${bold}$default${norm}): " H
H=${H:-$default}

default="0"
read -p "Top Corner from left hand side(${bold}$default${norm}): " x
x=${x:-$default}

default="0"
read -p "Top corner from top(${bold}$default${norm}): " y
y=${y:-$default}

convert $FileName*.$Extension -region ${W}x${H}+${x}+${y} -blur 0x8 conv-$FileName.$Extension

exit 0


Feel free to copy and use yourself.

Thanks everyone.

Thanks for Blur-Image.sh.
Regarding your initial question, give the following a try:

Nope doesn't work

Here's the screendump
onk@XEON4 ~/TEST/PIC/PIC $ ls *T*.*
T.jpg T.sh
onk@XEON4 ~/TEST/PIC/PIC $ echo $X $XX $Y $YY
30 178 15 55
onk@XEON4 ~/TEST/PIC/PIC $ convert T.jpg \(+clone -draw "rectangle '$X','$Y','$XX','$YY'" \) -composite conv-T.jpg
convert: unable to open image `(+clone': No such file or directory @ error/blob.c/OpenBlob/2712.
convert: no decode delegate for this image format `' @ error/constitute.c/ReadImage/501.
convert: non-conforming drawing primitive definition `rectangle' @ error/draw.c/DrawImage/3190.
convert: unable to parse expression `)' @ error/convert.c/ConvertImageCommand/601.


Putting the actual values in and running your suggestion also does not work
onk@XEON4 ~/TEST/PIC/PIC $ convert T.jpg \(+clone -draw "rectangle 30,15,178,55" \) -composite conv-T.jpg
convert: unable to open image `(+clone': No such file or directory @ error/blob.c/OpenBlob/2712.
convert: no decode delegate for this image format `' @ error/constitute.c/ReadImage/501.
convert: unable to parse expression `)' @ error/convert.c/ConvertImageCommand/601.

This is what does work:
onk@XEON4 ~/TEST/PIC/PIC $ convert T.jpg \( +clone -draw 'rectangle 30,15,178,55' \) -composite conv-T.jpgjonk@XEON4 ~/TEST/PIC/PIC $

All I want to know is how to parameterise the rectangle co-ords in a bash script, it shouldn't be this hard surely?

Okay, here is another suggestion (not sure it works):

Excellent- that works just fine, now to create a bash script to prompt for the x,y coords etc

I'll post the script later

Many thanks

Just simplified this a bit so a script should work

onk@XEON4 ~/TEST/PIC/PIC $X=30;XX=178;Y=15;YY=55
onk@XEON4 ~/TEST/PIC/PIC $ convert T.jpg \( +clone -draw "rectangle $X,$Y,$XX,$YY" \) -composite conv-T.jpg
onk@XEON4 ~/TEST/PIC/PIC $

So here's a script that does work and draws a black rectangle of a specified height and width with the top left hand corner at a specified distance from the top left hand corner of the image

black-rectangle.sh
==================
#!/bin/bash
renice 19 -p $$

bold=$(tput bold)
norm=$(tput sgr0)

read -p "Files to process (name only): " FileName

default="jpg"
read -p "Files extension (${bold}$default${norm}|png|...): " Extension
Extension=${Extension:-$default}

default="0"
read -p "Width(${bold}$default${norm}): " W
W=${W:-$default}


default="0"
read -p "Height(${bold}$default${norm}): " H
H=${H:-$default}

default="0"
read -p "Top Corner from left hand side(${bold}$default${norm}): " x
x=${x:-$default}


default="0"
read -p "Top corner from top(${bold}$default${norm}): " y
y=${y:-$default}

convert $FileName.$Extension \( +clone -draw "rectangle $W,$H,$x,$y" \) -composite conv-$FileName.$Extension

exit 0


Feel free to use it

I would like to alter the colour of the rectangle tho', over to you smart fellers for that one....

Glad it works :)

You need to use the -fill setting before "rectangle".

Cheers, I actually found the -fill option elsewhere, but much appreciate your tip, here's the completed line

convert $FileName.$Extension \( +clone -fill grey59 -draw "rectangle $X,$Y,$XX,$YY" \) -composite conv-$FileName.$Extension

Works perefectly

Welcome to LQ GPGAgent!

Glad that you found help, and thanks to those who replied!

In future, please place your code and command snippets inside [CODE]...[/CODE] tags for better readability. You may type those yourself or click the "#" button in the edit controls.

Thanks!

Hi No problem, didn't spot that one! :o

From now on my code will look like And of course you can post a bit of PHP code
originally an acronym for Personal Home Pages - or is that an urban myth?

:D