lut_transT_lut_transLutTransLutTranslut_trans (Operator)

Name

lut_transT_lut_transLutTransLutTranslut_trans — Transform an image with a gray-value look-up-table

Signature

lut_trans(Image : ImageResult : Lut : )

Description

lut_translut_transLutTransLutTransLutTranslut_trans transforms an image ImageImageImageImageimageimage by using a gray value look-up-table LutLutLutLutlutlut. This table acts as a transformation function. In the case of byte-images, LutLutLutLutlutlut has to be a tuple of length 256. In the case of int2-images, LutLutLutLutlutlut has to be a tuple of length 256 <= length <= 65536. If the length of the LutLutLutLutlutlut is <= 32768, the transformation is applied to the positive gray values only, i.e., the first element of the LutLutLutLutlutlut specifies the new gray value for the gray value 0. If the LutLutLutLutlutlut is longer than 32768, exactly 65536 must be passed. In this case, the positive and negative gray values are transformed. In this case, the first element indicates the new gray value for the gray value -32768 of the input image, while the last element of the tuple indicates the new gray value for the gray value 32767. In all cases, the gray values of values outside the range of LutLutLutLutlutlut are set to 0. In the case of uint2-images, LutLutLutLutlutlut has to be a tuple of length 256 <= length <= 65536. Gray values outside the range of LutLutLutLutlutlut are set to 0.

Attention

lut_translut_transLutTransLutTransLutTranslut_trans can be executed on OpenCL devices.

Execution Information

Supports OpenCL compute devices.
Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Automatically parallelized on tuple level.
Automatically parallelized on channel level.
Automatically parallelized on domain level.

Parameters

ImageImageImageImageimageimage (input_object) (multichannel-)image(-array) → object (byte* / int2* / uint2*) *allowed for compute devices

Image whose gray values are to be transformed.

ImageResultImageResultImageResultImageResultimageResultimage_result (output_object) (multichannel-)image(-array) → object (byte / int2 / uint2)

Transformed image.

LutLutLutLutlutlut (input_control) integer-array → (integer)

Table containing the transformation.

Example (HDevelop)

* Apply a gamma correction to an image.
Gamma := 2.2
GammaLUT := []
for G := 0 to 255 by 1
    GammaLUT := [GammaLUT,round(255.0*pow(G/255.0,1.0/Gamma))]
endfor
read_image (Image, 'mreut')
lut_trans (Image, ImageGamma, GammaLUT)

Result

The operator lut_translut_transLutTransLutTransLutTranslut_trans returns the value 2 ( H_MSG_TRUE) if the parameters are correct. Otherwise an exception is raised.

Module

Foundation

Operators