I was inspired by this topic to implement brightness and contrass in my camera app, but when I playing with gamma/contrast it doesn't work at all.
Im using createCaptureRequest(CameraDevice.TEMPLATE_RECORD) mode in Android Camera2 API.
The problem is the bellow code has no effect on the video preview:
captureRequestBuilder.set(CaptureRequest.TONEMAP_MODE, CaptureRequest.TONEMAP_MODE_GAMMA_VALUE)
captureRequestBuilder.set(CaptureRequest.TONEMAP_GAMMA, level)
captureSession.setRepeatingRequest(
captureRequestBuilder.build(), null, null)
Whatever level value I set it's just nothing.
Another problem with contrast:
private val channels by lazy {
val tc = captureRequestBuilder.get(CaptureRequest.TONEMAP_CURVE) ?: return@lazy null
val channels = arrayOf(floatArrayOf(), floatArrayOf(), floatArrayOf())
for(channel in TonemapCurve.CHANNEL_RED .. TonemapCurve.CHANNEL_BLUE) {
val contrast = FloatArray(tc.getPointCount(channel) * 2)
tc.copyColorCurve(channel, contrast, 0)
channels[channel] = contrast
}
channels
}
fun setContrast(level: Float) {
val level = level.coerceIn(0f, 1f)
val channels = channels ?: return
val newContrast = arrayOf(floatArrayOf(), floatArrayOf(), floatArrayOf())
for(channel in TonemapCurve.CHANNEL_RED .. TonemapCurve.CHANNEL_BLUE) {
val contrast = FloatArray(channels[channel].size)
System.arraycopy(channels[channel], 0, contrast, 0, contrast.size)
contrast.forEachIndexed { index, _ ->
contrast[index] *= level
}
newContrast[channel] = contrast
}
val newValue = TonemapCurve(newContrast[TonemapCurve.CHANNEL_RED],
newContrast[TonemapCurve.CHANNEL_GREEN],
newContrast[TonemapCurve.CHANNEL_BLUE])
captureRequestBuilder.set(CaptureRequest.TONEMAP_MODE, CaptureRequest.TONEMAP_MODE_CONTRAST_CURVE)
captureRequestBuilder.set(CaptureRequest.TONEMAP_CURVE, newValue)
captureSession.setRepeatingRequest(
captureRequestBuilder.build(), null, null)
}
captureRequestBuilder.get(CaptureRequest.TONEMAP_CURVE) always return null and even if try to set manually captureRequestBuilder.set(CaptureRequest.TONEMAP_CURVE, newValue) is still no any changes on video preview.
There is any solution how to implement contrast and gamma properly on Android camera video preview with CameraDevice.TEMPLATE_RECORD ?
