How to save/restore the background color

[vischer]

Hi Wayne,

Hello all,

I need to temporarily change the background color and then restore it.
Below is a rather awkward macro to do this. I need to create a dummy RGB image,
because otherwise getValue("color.background") returns either
a 24-bit color or an 8-bit index, depending on the type of the front window.
It also would be nice if colors could be set with either one 24-bit or three 8-bit arguments.

My question: is the getValue("color.background") behavior intended as it is, and is there
an easier way to save and restore the background color?


//save background color  ---
newImage("dummy", "RGB White", 200, 20, 1);
backColor = getValue("color.background");
close;


//restore background color ---
r = backColor&0x0ff0000>>16;
g = backColor&0x0ff00>>8;
b = backColor&0x0ff;
setBackgroundColor(r, g, b)



Norbert Vischer

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[vischer]

> I need to temporarily change the background color and then restore it.
> Below is a rather awkward macro to do this. I need to create a dummy RGB image,
> because otherwise getValue("color.background") returns either
> a 24-bit color or an 8-bit index, depending on the type of the front window.
> It also would be nice if colors could be set with either one 24-bit or three 8-bit arguments.
>
> My question: is the getValue("color.background") behavior intended as it is, and is there
> an easier way to save and restore the background color?
>
>
> //save background color  ---
> newImage("dummy", "RGB White", 200, 20, 1);
> backColor = getValue("color.background");
> close;
>
>
> //restore background color ---
> r = backColor&0x0ff0000>>16;
> g = backColor&0x0ff00>>8;
> b = backColor&0x0ff;
> setBackgroundColor(r, g, b)
>
>
>
> Norbert Vischer
>

Meanwhile, I found saveSettings() and restoreSettings() which makes things simpler, but I also need to know the value of the background color, so I still need the dummy window.


Norbert Vischer
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[Rasband, Wayne (NIH/NIMH) [E]]

On Dec 2, 2012, at 9:21 AM, Norbert Vischer wrote:

>> I need to temporarily change the background color and then restore it.
>> Below is a rather awkward macro to do this. I need to create a dummy RGB image,
>> because otherwise getValue("color.background") returns either
>> a 24-bit color or an 8-bit index, depending on the type of the front window.
>> It also would be nice if colors could be set with either one 24-bit or three 8-bit arguments.
>>
>> My question: is the getValue("color.background") behavior intended as it is, and is there
>> an easier way to save and restore the background color?
>>
>> //save background color  ---
>> newImage("dummy", "RGB White", 200, 20, 1);
>> backColor = getValue("color.background");
>> close;
>>
>> //restore background color ---
>> r = backColor&0x0ff0000>>16;
>> g = backColor&0x0ff00>>8;
>> b = backColor&0x0ff;
>> setBackgroundColor(r, g, b)
>>
>> Norbert Vischer
>
> Meanwhile, I found saveSettings() and restoreSettings() which makes things simpler, but I also need to know the value of the background color, so I still need the dummy window.

The getValue("rgb.background") macro function, available in v1.47g or later, returns the value of the background color. ImageJ 1.47g also adds setForegroundColor(value) and setBackgroundColor(value) functions.

-wayne

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