<div dir="ltr"><div><div>Hi Alessandro,<br><br></div>for unsigned char 3 component images, I wrote a customized version of vtkImageMapToWindowLevelColors to work on multi-component images. In the unmodified<br></div><div>
(vtk) version of this class, only the first component of multi-component images is modified, as described in the class documentation:<br><br>"The <a class="" href="http://www.vtk.org/doc/release/5.10/html/classvtkImageMapToWindowLevelColors.html" title="map the input image through a lookup table and window / level it">vtkImageMapToWindowLevelColors</a>
filter will take an input image of any valid scalar type, and map the
first component of the image through a lookup table. This resulting
color will be modulated with value obtained by a window / level
operation. The result is an image of type VTK_UNSIGNED_CHAR. If the
lookup table is not set, or is set to NULL, then the input data will be
passed through if it is already of type UNSIGNED_CHAR."<br><br></div><div>here are the mods to lines 366 to 401 of vtkImageMapToWindowLevelColors.cxx in VTK 5.10<br><br>364 else<br>365 {<br>366 for (idxX = 0; idxX < extX; idxX++)<br>
367 {<br>368 for(int j = 0; j < numberOfComponents; ++j )<br>369 {<br>370 if( j == (numberOfComponents - 1 ) &&<br>371 (outputFormat == VTK_LUMINANCE_ALPHA ||<br>
372 outputFormat == VTK_RGBA) )<br>373 {<br>374 *(optr) = 255;<br>375 }<br>376 else<br>377 {<br>378 if (*iptr <= lower)<br>
379 {<br>380 result_val = lower_val;<br>381 }<br>382 else if (*iptr >= upper)<br>383 {<br>384 result_val = upper_val;<br>385 }<br>
386 else<br>387 {<br>388 result_val = static_cast<unsigned char>((*iptr + shift)*scale);<br>389 }<br>390 *optr = result_val;<br>391 }<br>
392 iptr++;<br>393 optr++;<br>394 }<br>395 }<br>396 }<br><br><br></div><div>regards,<br>Dean<br></div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Tue, Apr 16, 2013 at 5:02 PM, Alessandro <span dir="ltr"><<a href="mailto:notinmyhead@gmail.com" target="_blank">notinmyhead@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi,<br>
<br>
I'm trying to apply Brightness and Contrast to a blended image, created from a Grey Image and a Color one. I set brightness and contrast via vtkImageViewer2 SetColorWindow and SetColorLevel methods but it doesn't work on the blended one: as soon as I set one of them, the image becomes a Grey one.<br>
<br>
Any suggestion?<br>
<br>
Thanks,<br>
Ale<br>
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