jmagick-users — jmagick users - general discussion regarding jmagick

[Jmagick-users] Convert TIF to JP2

[Timothy T. <tim...@ho...>]

Hi

I'm trying to convert a tif-image to the JP2-format.. It's no problem to convert, but the resulting image is much darker. Any clue how I can avoid this? And is there any possibility to set a compression-rate? (1/5 e.g.)

Thanks!

Timothy


From: tim...@ho...
To: jma...@li...
Date: Fri, 21 Mar 2008 06:59:51 +0000
Subject: [Jmagick-users] extract color channels















Dear all

Currently I'm writing a java-program to create a pdf from a collection of images. The images in the collection are a grayscale with a coloured overlays. (example image attached)

I want to extract the coloured pixels and create from them 3 new binary images (with only the full red, the full green and the full blue values).

The imagemagick commands are the following:

1. extract different color channels
    > convert test.png -channel R -separate out0.png
    > convert test.png -channel G -separate out1.png
    > convert test.png -channel B -separate out2.png

2. create images which contain 2 of the 3 basic colors

    > convert -threshold 0,0,0 out0.png bluegreen.png
    > convert -threshold 0,0,0 out1.png redblue.png
    > convert -threshold 0,0,0 out2.png redgreen.png

3. Compare 2 binary images and extract a color
    > composite -compose minus redblue.png redgreen.png green.png
    > composite -compose minus redgreen.png bluegreen.png blue.png
    > composite -compose minus bluegreen.png redgreen.png red.png

4. Create 1 bit images

    > convert red.png -colors 2 -colorspace gray -type bilevel red1bit.png
    > convert green.png -colors 2 -colorspace gray -type bilevel green1bit.png
    > convert blue.png -colors 2 -colorspace gray -type bilevel blue1bit.png

Anybody any clue how to do this with JMagick? (this procedure probably can be shorter, but this are the different steps I did, so it might be clearer to understand my problem)

Thanks in advance!

Timothy


 

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Re: [Jmagick-users] extract color channels

[Bob F. <bfr...@si...>]

> Anybody any clue how to do this with JMagick? (this procedure 
> probably can be shorter, but this are the different steps I did, so 
> it might be clearer to understand my problem)

I would check for a ChannelImage functionality in JMagick since this 
used to be how to tell ImageMagick extract a channel into an Image.

Bob
======================================
Bob Friesenhahn
bfr...@si..., http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

Re: [Jmagick-users] extract color channels

[Jacob N. <jac...@gm...>]

I use this code to get pixel channels out of an image:

        byte[] r_array = new byte[width * height];
        magickimage.dispatchImage(0, 0, width, height, "R", r_array);

would get the red channel.

To combine channels I use compositeImage()
        magickRed.constituteImage(width,height,"R", r_array);
        magickimage.compositeImage(CompositeOperator.CopyRedCompositeOp,
magickRed, 0, 0);

I hope this helps

Jacob


2008/3/21, Timothy Tiesters <tim...@ho...>:
>
>
>
>
>
>
> Dear all
>
> Currently I'm writing a java-program to create a pdf from a collection of images. The images in the collection are a grayscale with a coloured overlays. (example image attached)
>
> I want to extract the coloured pixels and create from them 3 new binary images (with only the full red, the full green and the full blue values).
>
> The imagemagick commands are the following:
>
> 1. extract different color channels
>     > convert test.png -channel R -separate out0.png
>     > convert test.png -channel G -separate out1.png
>     > convert test.png -channel B -separate out2.png
>
> 2. create images which contain 2 of the 3 basic colors
>
>     > convert -threshold 0,0,0 out0.png bluegreen.png
>     > convert -threshold 0,0,0 out1.png redblue.png
>     > convert -threshold 0,0,0 out2.png redgreen.png
>
> 3. Compare 2 binary images and extract a color
>     > composite -compose minus redblue.png redgreen.png green.png
>     > composite -compose minus redgreen.png bluegreen.png blue.png
>     > composite -compose minus bluegreen.png redgreen.png red.png
>
> 4. Create 1 bit images
>
>     > convert red.png -colors 2 -colorspace gray -type bilevel red1bit.png
>     > convert green.png -colors 2 -colorspace gray -type bilevel green1bit.png
>     > convert blue.png -colors 2 -colorspace gray -type bilevel blue1bit.png
>
> Anybody any clue how to do this with JMagick? (this procedure probably can be shorter, but this are the different steps I did, so it might be clearer to understand my problem)
>
> Thanks in advance!
>
> Timothy
>
>
>
>
> ________________________________
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> -------------------------------------------------------------------------
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>



-- 
Jacob Nordfalk
http://javabog.dk
Skype: jacobnordfalk

[Jmagick-users] extract color channels

[Timothy T. <tim...@ho...>]

Dear all

Currently I'm writing a java-program to create a pdf from a collection of images. The images in the collection are a grayscale with a coloured overlays. (example image attached)

I want to extract the coloured pixels and create from them 3 new binary images (with only the full red, the full green and the full blue values).

The imagemagick commands are the following:

1. extract different color channels
    > convert test.png -channel R -separate out0.png
    > convert test.png -channel G -separate out1.png
    > convert test.png -channel B -separate out2.png

2. create images which contain 2 of the 3 basic colors

    > convert -threshold 0,0,0 out0.png bluegreen.png
    > convert -threshold 0,0,0 out1.png redblue.png
    > convert -threshold 0,0,0 out2.png redgreen.png

3. Compare 2 binary images and extract a color
    > composite -compose minus redblue.png redgreen.png green.png
    > composite -compose minus redgreen.png bluegreen.png blue.png
    > composite -compose minus bluegreen.png redgreen.png red.png

4. Create 1 bit images

    > convert red.png -colors 2 -colorspace gray -type bilevel red1bit.png
    > convert green.png -colors 2 -colorspace gray -type bilevel green1bit.png
    > convert blue.png -colors 2 -colorspace gray -type bilevel blue1bit.png

Anybody any clue how to do this with JMagick? (this procedure probably can be shorter, but this are the different steps I did, so it might be clearer to understand my problem)

Thanks in advance!

Timothy


 

Start een boeiend online leven...helemaal gratis! Windows Live 

_________________________________________________________________
Deel gratis al je leukste eindejaarsmomenten...
http://get.live.com

Re: [Jmagick-users] release dates

[Jacob N. <jac...@gm...>]

Hi Raja,

currently things are a bit messy as we are transfering the project to a new
site,
but please tell which platform do you need binaries for and lets see in we
can manage.

Jacob

2008/3/14, Raja Nagendra Kumar <nag...@te...>:
>
>  Hi,
>
> Could any one provide details of jmagick release time line. We are looking
> to have web croping tool with imagemagick at back end.
>
> Thanking you in advance.
>
> Regards,
> Nagendra
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> Jmagick-users mailing list
> Jma...@li...
> https://lists.sourceforge.net/lists/listinfo/jmagick-users
>
>


-- 
Jacob Nordfalk
http://javabog.dk
Skype: jacobnordfalk

[Jmagick-users] release dates

[Raja N. K. <nag...@te...>]

Hi,

Could any one provide details of jmagick release time line. We are looking to have web croping tool with imagemagick at back end.

Thanking you in advance.

Regards,
Nagendra