Re: How are images larger than the display window rendered?

Posted by Kenneth Sloan-2 on May 31, 2021; 10:02pm
URL: http://imagej.273.s1.nabble.com/How-are-images-larger-than-the-display-window-rendered-tp5024669p5024671.html

Well..."strictly speaking" the display software should gamma correct the original (non-zoomed) version of the image, too.  I don't think that is done, so I wouldn't worry about how averaging is done, either.

Now...suppose I have applied a gamma-correcting LUT.  Does the averaging process deal with the original data (in which case, the LUT will continue to do the right thing) or does it deal with the pixel values AFTER transformation by the LUT?

Same question for the case when the LUT colorizes a scalar image - are the *colors* averaged, or the scalar pixel values?

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Kenneth Sloan
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Vision is the art of seeing what is invisible to others.





> On May 31, 2021, at 09:17, Michael Schmid <[hidden email]> wrote:
>  
> (Strictly speaking, since the display is nonlinear, one should not use a mid gray level like 128 for the average of two pixels with 255 and two with 0 but take the Gamma value of the display into account. At least my Java version does not do this.)
 
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