Re: [udig-users] change pixel color

[andrea antonello <andrea.antonello@xxxxxxxxx>]

Hi Simone,
I am afraid you chose a busy period to get help on the list, since the
developers just came back from Foss4G and some of them are still
struggling with the pile of work they found waiting at home and the
jetlag.

Anyways, the more information you supply and the more help you will get.

I was thinking this is a styling question of a user, since you are
writing to the udig-users list as opposed to the udig-devel.
If you are talking about code, then I do not understand what exactly
you want to do. Change the values or change the colors?

If you want to change the colors, as I mentioned before, get into the
rastersymbolizer and ask for help in the geotools list.
There is another way to do so inside the code, but it requires some
more study about categories in gridcoverages. We are doing this for
reading grass colormaps and set them by default on gridcoverages:
https://dev.cocos.bz/plugins/scmsvn/viewcvs.php/jgrass3.0/trunk/eu.hydrologis.jgrass.libs/src/eu/hydrologis/jgrass/libs/iodrivers/geotools/GrassCoverageReader.java?rev=2744&root=jgrass&view=markup


Andrea



On Mon, Nov 2, 2009 at 11:27 AM, simone amagliani <simone_a@xxxxxxxxxx> wrote:
> I have tried to see "catalog", however I have not understand as I can do for
> changing the color to the pixels.
> There is someone that can tell me as I can do for resolving my problem.
> Thanks
> Simone
>
> ________________________________
> Subject: Re: [udig-users] change pixel color
> From: jody.garnett@xxxxxxxxx
> Date: Sat, 31 Oct 2009 22:05:40 +1100
> CC: udig-users@xxxxxxxxxxxxxxxxxxxxx
> To: simone_a@xxxxxxxxxx
>
> Hi Simone:
> The catalog allows you to access the image using the Java Advanced Imaging
> and ImageIO. I do not know much about using these for editing images in
> place; they do provide a Raster model that is used for sampling values.
> - http://java.sun.com/developer/onlineTraining/javaai/
> Jody
> On 31/10/2009, at 8:45 PM, simone amagliani wrote:
>
> Is not there anybody that can help me?
>
> Now I try to explain better what I want to do.
> I use images tif, and I want to change color to the pixels going to directly
> act on the matrix that the image represents.
> With the istruction "getContext () " I know the selected layer, now I would
> want to do:
> - to find the matrix that represents the image;
> - with cycles "for" to modify the value of the colors of the pixels;
> - to replace the old layer with the modified one;
>
> Could someone tell me as I can do?
> Thanks
>
> PS:I hope that my English is comprehensible  :D
>
> Simone
>
>> Date: Tue, 27 Oct 2009 10:37:37 +0100
>> From: andrea.antonello@xxxxxxxxx
>> CC: udig-users@xxxxxxxxxxxxxxxxxxxxx
>> Subject: Re: [udig-users] change pixel color
>>
>> Hi Simone,
>> what version of udig are you using?
>> What type of raster data are you loading?
>> Andrea
>>
>> On Tue, Oct 27, 2009 at 10:29 AM, simone amagliani <simone_a@xxxxxxxxxx>
>> wrote:
>> > Thanks for your help.
>> > The result that I want to get is really that, but I have not understood
>> > whether to do (I am not very practical of Udig).
>> > Could you give me some suggestion?
>> > Thanks
>> >
>> > Simone
>> >
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>> >
>> >
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