http://imagej.273.s1.nabble.com/how-to-mark-single-pixel-in-a-overlay-tp5015334p5015352.html
Absolutely NOT. A pixel is an *area*, not a *point*.
Where this area is wrt an x,y coordinate is a matter of *convention*, not *taste*
The first order of business for any image processing system is to establish and enforce that convention.
> On Jan 7, 2016, at 08:30 , Herbie <
[hidden email]> wrote:
>
> Dear Jeremy,
>
> let's face it: A pixel has no extension, it is a (point with an associated) number.
>
> What you call a pixel, is part of a zero-order interpolation of an array of points (numbers), i.e. an area of equal gray-level or colour.
>
> How this area is positioned with respect to the underlying number is a matter of taste. The area may be centered to the number or the number may be on its upper left corner.
>
> Guess what is the case when displaying images in ImageJ...
>
> I know, all this won't help with your problem, but perhaps it makes the issue clearer.
>
> Best
>
> Herbie
>
> ::::::::::::::::::::::::::::::::::::::::::
> Am 07.01.16 um 13:45 schrieb Jeremy Adler:
>> I am want to use the overlay to mark a single pixel in an image that
>> has been zoomed to show individual pixels - within a macro.
>>
>> But I cannot see how to mark a single pixel in the overlay.
>> Overlay.drawRect marks an area of 2x2 pixels centred on my target
>> pixel but 1x1 Overlay.drawLine with the two positions set the same,
>> marks a single pixel offset
>>
>> I can mark a single pixel using the ROI manager and then move it and
>> convert it to an overlay, but this seems unduly cumbersome, is there
>> a better way of marking single pixels in a overlay ?
>>
>>
>> Dr Jeremy Adler Senior res engineer BioVis Dag Hammarskjölds väg 20
>> Uppsala Universitet, 752 37 Uppsala ,Sweden
>>
>>
>>
>> +46 70 1679349
>>
>>
http://www.biovis.uu.se>>
>>
>>
>>
>> -- ImageJ mailing list:
http://imagej.nih.gov/ij/list.html>>
>
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