MantisBT - VTK
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IDProjectCategoryView StatusDate SubmittedLast Update
0001843VTK(No Category)public2005-05-11 15:412016-08-12 09:54
ReporterMark Wyszomierski 
Assigned ToWill Schroeder 
PrioritynormalSeveritymajorReproducibilityalways
StatusclosedResolutionmoved 
PlatformOSOS Version
Product Version 
Target VersionFixed in Version 
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Type
Summary0001843: vtkImageMapToWindowLevelColors can do win/level on RGB data with no LUT
DescriptionIn 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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Issue History
Date ModifiedUsernameFieldChange
2011-06-16 13:11Zack GalbreathCategory => (No Category)
2016-08-12 09:54Kitware RobotNote Added: 0036785
2016-08-12 09:54Kitware RobotStatusexpired => closed
2016-08-12 09:54Kitware RobotResolutionopen => moved

Notes
(0036785)
Kitware Robot   
2016-08-12 09:54   
Resolving issue as `moved`.

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