[osg-users] adjusting brightness and contrast in osgviewer

[zhenlong li]

Dear all,

 

Is there any function to adjust the brightness or contrast of image in osgviewer?

 

If not, is it hard to add those functions in? Thanks!

 

 

with best wishes

Zhenlong

 

 

[Trajce (Nick) Nikolov]

Hi,

I dont think there are built in methods in osg for this. But I see it doable via shaders - this way you can do any image processing you want.

-Nick

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[zhenlong li]

Thanks, Nick. I just wonder if it is hard to create such a common function in osg for brightness and

 

contrast adjustment of JPEG image, say add a filter. As I know, shader is not the same as real

 

adjustment of brightness and contrast.

 

with best wishes

Zhenlong

 

Subject: Re: [osg-users] adjusting brightness and contrast in
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[Trajce (Nick) Nikolov]

As I know, shader is not the same as real

 

adjustment of brightness and contrast.

I think it is ....

-Nick

[Robert Osfield]

Hi Zhenlong,

On Wed, Mar 10, 2010 at 4:16 PM, zhenlong li <zxl...@gmail.com> wrote:

Thanks, Nick. I just wonder if it is hard to create such a common function in osg for brightness and

 

contrast adjustment of JPEG image, say add a filter. As I know, shader is not the same as real

 

adjustment of brightness and contrast.

I'm rather perplexed by your questions/request.  The OSG isn't a monitor that you twist some dials and change the brightness.  It's and scene graph API that is closely linked with OpenGL, it's general purpose, but with it you the developer have to code solution to problems that you are trying to solve.  There are many ways of changing attributes related to OpenGL rendering with the OSG, but given the nature of your questions I really not sure advice in the direction will be helpful, as your questions seem directed at stuff that is too high level for what one would expect from a scene graph API.  

Are you familiar with OpenGL/3D graphics/scene graphs?  Is it a problem with your data?  Is it a problem with lighting?  What are you trying to achieve with your application?

You'll need to pass on more information about what you are trying to do, and how much knowledge others can assume you to have otherwise we really won't know how to help you.

Robert.