Re: non-color-scaled rgbimage plots

[Dima K. <gn...@di...>]

Ethan A Merritt <sf...@us...> writes:

>> > Right now the program ignores the "noautoscale" keyword for image plots.
>> > I'm not sure what would happen if that were to change.
>> > If you experiment with the code, that's where I suggest starting.
>>
>> "noautoscale" applies to the whole plot, does it not?
>
> It applies to only one component of the plot at a time.
> The idea is so you can plot x, y, and z but only scale to fit y.
> I.e. points from x and z may be outside the range defined by y.
>
>   plot 'x' noautoscale, 'y', 'z' noautoscale

Interesting. The documentation describes the per-axis usage, but not the
per-data usage that you mention here. This is clearly the appropriate
option to hook into.


> It makes sense for input RGB PNG images, but I am not certain it
> generalizes.
>
> For that matter I'm not clear on what "autoscale" even means for
> rgbimage data.  For image data it ends up controlling cbrange for
> the palette mapping.  But for rgb images there is no palette, so
> what exactly is being scaled?
>
> This is not a part of the code that I know very well.
> Right now I don't have any opinion on it because I don't really
> understand what it does now or what the other options might be.

OK. I'll take a look. For what it's worth, my images actually ARE
grayscale, but plotting them "with rgbimage" works while "with image"
does not. I'll look.

Thanks for the pointers.