(Solved) convert -level not working properly

[fernandokts]

When I use convert with the -level parameter, it affects everything in the command, even if I separate the other images with "\( \)"

Example:
convert \( rose: -level 70,75% \) \( rose: \) -compose Screen -composite rose.jpg

When I use the above command, the first and the second "rose:" is affected by -level.

But when I do exactly the same thing with any other parameter, like blur, it works ok (affecting only the first "rose:").

Example:
convert \( rose: -blur 0x5 \) \( rose: \) -compose Screen -composite rose.jpg

The above command works fine. It seems to happen only with "-level"

I'm currently using ImageMagick 6.4.9-3 in linux.

[fmw42]

see -respect-parenthesis http://www.imagemagick.org/script/comma ... arentheses

convert -respect-parenthesis \( rose: -level 70,75% \) \( rose: \) -compose Screen -composite rose.jpg

[fernandokts]

It still doesn't work.
With other filters the parentheses are being respected even without "respect-parentheses".

Thank you for your reply.

[fmw42]

It still doesn't work.
With other filters the parentheses are being respected even without "respect-parentheses".

Thank you for your reply.

It is singular, -respect-parenthesis, not plural -respect-parentheses. Did you misspell it?


This seems to work fine for me:

convert -respect-parenthesis \( rose: -level 70,75% \) \( rose: \) +append rose_append.jpg

This also works fine for me:

convert \( rose: -level 70,75% \) \( rose: \) +append rose_append2.jpg


So might it be related to your -compose screen -composite?

see http://www.imagemagick.org/Usage/compose/#screen to see if that is the compose setting you really want.

[fernandokts]

Actually I used in singular, just wrote wrong in the forum.
That is really strange...
When I save an image of the "-level" command with "rose:", and then do the compose, it works. It only doesn't work when I try to do all in the same line.

convert rose: -level 70,75% rose_highcontrast.jpg
convert rose_highcontrast.jpg rose: -compose screen -composite rose_final.jpg

The above works. But I need to do it all in the same line, cause I'm making a script to do this with an image sequence. So I think, it would be faster not using a temporarily file.

Actually, It doesn't work with any other -compose mode (Plus, Multiply, etc...)

[fmw42]

Actually I used in singular, just wrote wrong in the forum.
That is really strange...
When I save an image of the "-level" command with "rose:", and then do the compose, it works. It only doesn't work when I try to do all in the same line.

convert rose: -level 70,75% rose_highcontrast.jpg
convert rose_highcontrast.jpg rose: -compose screen -composite rose_final.jpg

The above works. But I need to do it all in the same line, cause I'm making a script to do this with an image sequence. So I think, it would be faster not using a temporarily file.

Actually, It doesn't work with any other -compose mode (Plus, Multiply, etc...)

These all seems to work for me and produces the same result as your rose_final.jpg

convert \( rose: -level 70,75% \) rose: -compose screen -composite rose_test1.jpg

convert rose: \( +clone -level 70,75% \) -compose screen -composite rose_test2.jpg

convert rose: \( +clone -level 70,75% \) -compose lighten -composite rose_test3.jpg

convert \( rose: -level 70,75% \) miff:- | convert - rose: -compose screen -composite rose_test4.jpg

convert \( rose: -level 70,75% -write mpr:rose \) -delete 0 mpr:rose rose: -compose screen -composite rose_test5.jpg

IM 6.4.9-8 Q16 Mac OSX Tiger

[fernandokts]

Actually I used in singular, just wrote wrong in the forum.
That is really strange...
When I save an image of the "-level" command with "rose:", and then do the compose, it works. It only doesn't work when I try to do all in the same line.

convert rose: -level 70,75% rose_highcontrast.jpg
convert rose_highcontrast.jpg rose: -compose screen -composite rose_final.jpg

The above works. But I need to do it all in the same line, cause I'm making a script to do this with an image sequence. So I think, it would be faster not using a temporarily file.

Actually, It doesn't work with any other -compose mode (Plus, Multiply, etc...)

These all seems to work for me and produces the same result as your rose_final.jpg

convert \( rose: -level 70,75% \) rose: -compose screen -composite rose_test1.jpg

convert rose: \( +clone -level 70,75% \) -compose screen -composite rose_test2.jpg

convert rose: \( +clone -level 70,75% \) -compose lighten -composite rose_test3.jpg

convert \( rose: -level 70,75% \) miff:- | convert - rose: -compose screen -composite rose_test4.jpg

convert \( rose: -level 70,75% -write mpr:rose \) -delete 0 mpr:rose rose: -compose screen -composite rose_test5.jpg

IM 6.4.9-8 Q16 Mac OSX Tiger

All your examples that use lighten work for me, but the ones that use screen don't.
And when I write to an image, then load it in other command with screen, it works. I will do with the lighten, that is almost the same as screen.

Thank's fmw42, for your attention and patience!

[anthony]

When I use convert with the -level parameter, it affects everything in the command, even if I separate the other images with "\( \)"

Example:
convert \( rose: -level 70,75% \) \( rose: \) -compose Screen -composite rose.jpg

When I use the above command, the first and the second "rose:" is affected by -level.

when I remove the composition of the two images I see that -level was only applied to the first rose image. the second was NOT effected. Of course -screen will combine things and so a change in one rose image will effect the overall result.

[fernandokts]

when I remove the composition of the two images I see that -level was only applied to the first rose image. the second was NOT effected. Of course -screen will combine things and so a change in one rose image will effect the overall result.

Anthony,
when you do this without the -composite, it generates two images: rose-0.jpg and rose-1.jpg.
The rose-0.jpg is the result of the first part of the command "\( rose: -level 70,75% \)" and rose-1.jpg is the result of the second part "rose:", without -composite the -compose Screen is ignored right?

So, when you type this:
convert \( rose-0.jpg \) \( rose-1.jpg \) -compose Screen -composite final.jpg

Shouldn't it be the same as:
convert \( rose: -level 70,75% \) \( rose: \) -compose Screen -composite final.jpg
??

I'm just curious why they return different results...

[fmw42]

All your examples that use lighten work for me, but the ones that use screen don't.
And when I write to an image, then load it in other command with screen, it works. I will do with the lighten, that is almost the same as screen.

Perhaps it is just you particular version of IM. Have you tried upgrading to the latest?

[anthony]

Have you tried using MIFF or PNG rather than lossy JPG for intermediate results?

[fernandokts]

Perhaps it is just you particular version of IM. Have you tried upgrading to the latest?

You're right!
I was using 6.4.9-3, and now I'm using 6.4.9-9 from today's SVN, and it works!

Have you tried using MIFF or PNG rather than lossy JPG for intermediate results?

I was using intermediate, just as an example... But I agree, the intermediate results should always use lossless formats.

Thank you all for your time!