topic Using the GC320 to adjust brightness, contrast, and hue in i.MX Processors

Using the GC320 to adjust brightness, contrast, and hue

sheldonrucker — Thu, 04 Jul 2013 00:03:56 GMT

Hello All,

I'm trying to find a way to adjust the brightness, contrast, and hue of a texture using the GC320 graphic processor on the i.MX6. Does anyone know if this is possible? If it is possible could you explain how or give a little example?

I've been reading through the "i.MX 6 2D API" but haven't come upon a solution.

Also, could someone point me at some example code for the 2D GPU API? I've looked in both LTIB and the Freescale documentation but haven't found anything.

Thank you,

Sheldon

Re: Using the GC320 to adjust brightness, contrast, and hue

andre_silva — Wed, 28 Aug 2013 14:48:31 GMT

I´m going to look for it and let you know

Re: Using the GC320 to adjust brightness, contrast, and hue

andre_silva — Fri, 30 Aug 2013 18:11:25 GMT

We Don´t have functions like that in the API, instead you could do that using the shaders (OpenGLES) or OpenCL, in this case, using gc2000.

regards,

Andre

Re: Using the GC320 to adjust brightness, contrast, and hue

sheldonrucker — Sat, 31 Aug 2013 15:13:47 GMT

Thanks you for checking on that Andre!

Unfortunately for the application I'm working on we need to use the 2D GPU. We've been able to get around the problem by making the color space adjustments by setting the color space conversion matrix via a frame buffer ioctl. This has the limitation in that it effects all items drawn to that particular frame buffer. However, we're only drawing the items whose color space we need adjusted to one frame buffer and overlaying the rest in another so that does the trick.

By the way do you know if Freescale provides any sample code for the 2D API? If so, would you please provide me a link?

Thank you,

Sheldon

Re: Re: Using the GC320 to adjust brightness, contrast, and hue

andre_silva — Wed, 04 Sep 2013 14:45:19 GMT

Hi Sheldon,

for the 2D API I only found the one attached, it will be available on the next gpu sdk release. Hope it helps you.

regards,

Andre

Re: Re: Using the GC320 to adjust brightness, contrast, and hue

sheldonrucker — Thu, 05 Sep 2013 18:49:00 GMT

Thank you Andre! I'm sure this will help.

Sheldon

Re: Re: Using the GC320 to adjust brightness, contrast, and hue

andre_silva — Wed, 25 Sep 2013 18:17:56 GMT

no problem, good luck =)

Re: Using the GC320 to adjust brightness, contrast, and hue

shanxigjz — Thu, 16 Jan 2014 05:31:14 GMT

Hi Sheldon,

I am trying to use CSC to adjust contrast of UI, do you have get this work?

could you give me some ideads how to get this work?

thank you very much.

Re: Using the GC320 to adjust brightness, contrast, and hue

sheldonrucker — Wed, 19 Feb 2014 16:32:05 GMT

Hello Gao,

I couldn't get it to work. I ended up modifying the CSC (color space conversion) matrix in the kernel. The only drawback with this method is that it modifies everything in the associated frame buffer.

Thank you,

Sheldon