Intensity with GPUImageLookupFilter

[maurrubio]

Hello, it would be possible to add a intensity variable in the GPUImageLookupFilter?

The idea is control how much of the end image will have the lookup filter applied. Alternatively if someone can help me to setup a code that uses the Alpha filter to mix the original image and the filtered image it would be great.

[travisweerts]

What I would recommend is learning to make your own custom filter and shader that does this, it's really not too difficult.

[maurrubio]

I tried to do it looking into the GL shader of the GPUImageLookupFilter code but I couldn't figure out how to apply the alpha channel only on the first texture image, could someone help me to progress further?

[Lotogram]

gl_FragColor = mix(textureColor, vec4(vec3(newColor),1.0), mixTexture);

the "textureColor" is the original texture, and "newColor" is the LookupFilter result, and mixTexture is the Alpha value which is (0 ~ 1.0), you can think it as intensity variable.

[maurrubio]

Thank you very much @Lotogram it worked well.

Maybe someone should consider to commit this setting to the main branch? I think it's quite useful.

Regards.

[Lotogram]

I think this is a basic shader, and developers could add any filters as
they like. Only need to learn more shader language. :-)

The GREAT GUPImage which Brad created, is the open platform which has
possibility to add any effect/filter/function you can image it.

Thanks Brad for his GUPImage!

On Sat, Apr 5, 2014 at 12:43 PM, maurrubio notifications@github.com wrote:

Closed #1485 #1485.

Reply to this email directly or view it on GitHubhttps://github.com//issues/1485
.

Best Regards,

Shawn | Support Team | Lotogram Technology LLC,.

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