<br><br><div class="gmail_quote">On Tue, Sep 21, 2010 at 1:43 PM, Martin Ulken <span dir="ltr"><<a href="mailto:martinulken@googlemail.com">martinulken@googlemail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div link="blue" vlink="purple" lang="DE">
<div>
<p class="MsoNormal"><span lang="EN-US">Hello</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">I am going to import an bmp image by using
the vtkBMPReader which works fine.</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">When I am going to access the pixels of the
image using “ image2->GetScalarComponentAsFloat(x,y,0,0) “ everything works
fine.</span></p>
<p class="MsoNormal"><span lang="EN-US">When I display the first greyvalues in row
y=0 I get the following: 21,36,58,63,… which is correct.</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Now I want to have a faster access… so I
create a pointer with the following commands:</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">vtkUnsignedCharArray* test=
vtkUnsignedCharArray::SafeDownCast(image2->GetPointData()->GetScalars());</span></p>
<p class="MsoNormal"><span lang="EN-US">test2=
test->GetPointer(VTK_UNSIGNED_CHAR);</span></p></div></div></blockquote><div><br>What do you mean by test->GetPointer(VTK_UNSIGNED_CHAR) ? The value to be passed in is simply the offset. Perhaps you meant to write test->GetPointer(0);<br>
<br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div link="blue" vlink="purple" lang="DE"><div>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Now the value of test[0] is 36. So I cannot
access the first column of the image.</span></p></div></div></blockquote><div><br>You mean test2[0] ?<br><br><br><br></div></div><br>