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0001843

VTK

(No Category)

public

2005-05-11 15:41

2016-08-12 09:54

Reporter

Mark Wyszomierski

Assigned To

Will Schroeder

Priority

normal

Severity

major

Reproducibility

always

Status

closed

Resolution

moved

Platform

OS Version

Product Version

Target Version

Fixed in Version

Summary

0001843: vtkImageMapToWindowLevelColors can do win/level on RGB data with no LUT

Description

In vtkImageMapToWindowLevelColors, if there is no lookup table but the input image data is RGB/RGBA, all the color channel data is set to the same win/level, making it appear greyscale when drawn to screen (at least through vtkImageViewer2 anyways).

Instead, in this case where there is no LUT but the image data is in the RGB/RGBA format, can we just do the scaling per component so that the color data is retained:

*optr = result_val;
case VTK_RGB:
    *(optr+1) = result_val;
    *(optr+2) = result_val;

to:

unsigned char rgb_lvl[3];

case VTK_RGB:

    for (int i = 0; i < 3; i++) {
        if (*(iptr + i) <= lower) {
            rgb[i] = lower_val;
        }
        else if (*(iptr + i) >= upper) {
            rgb[i] = upper_val;
        }
        else {
            rgb[i] = (unsigned char) ((*(iptr + i) + shift)*scale);
        }
    }
    *(optr+0) = rgb_lvl[0];
    *(optr+1) = rgb_lvl[1];
    *(optr+2) = rgb_lvl[2];
    break;

and so forth for RGBA/LUMINANCE cases. I just put that in to see if it works and the output looks ok.

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Notes
(0036785) Kitware Robot (administrator) 2016-08-12 09:54	Resolving issue as `moved`. This issue tracker is no longer used. Further discussion of this issue may take place in the current VTK Issues page linked in the banner at the top of this page.

Issue History
Date Modified	Username	Field	Change
2011-06-16 13:11	Zack Galbreath	Category	=> (No Category)
2016-08-12 09:54	Kitware Robot	Note Added: 0036785
2016-08-12 09:54	Kitware Robot	Status	expired => closed
2016-08-12 09:54	Kitware Robot	Resolution	open => moved