Pixel value under cursor?

[A. W. Dunstan]

How do you display the value of a pixel under the cursor?

Everything I've found via Google says to open the "Info Window" (listed
under the View menu item). My version (v2.6.6, on Fedora 10) has no "Info
Window" item on the View menu. Between "Fullscreen" and "Navigation Window"
there's only a menu separator. All the places I've found that refer to this
seem to be for Gimp versions 2.4 and earlier.

"Image Properties" has information about the image as a whole, but nothing
on a pixel-by-pixel basis.

I have a PNM image (gray scale, single plane) produced by a camera (the
camera produces some raw data which I turn into a PNM image). It'd be very
useful to inspect individual pixel values all over the image. I can sort-of
do it via kruler but having to move the ruler around is tedious & slow.

Thanks!

--
Al Dunstan, Software Engineer
OptiMetrics, Inc.
3115 Professional Drive
Ann Arbor, MI 48104-5131

"There are two ways of constructing a software design. One way is to make
it so simple that there are obviously no deficiencies. And the other way
is to make it so complicated that there are no obvious deficiencies."
- C. A. R. Hoare

[John K. Herreshoff]

A. W. Dunstan wrote:

> How do you display the value of a pixel under the cursor?
>
> Everything I've found via Google says to open the "Info Window" (listed
> under the View menu item). My version (v2.6.6, on Fedora 10) has no "Info
> Window" item on the View menu. Between "Fullscreen" and "Navigation
> Window"
> there's only a menu separator. All the places I've found that refer to
> this seem to be for Gimp versions 2.4 and earlier.
>
> "Image Properties" has information about the image as a whole, but nothing
> on a pixel-by-pixel basis.
>
> I have a PNM image (gray scale, single plane) produced by a camera (the
> camera produces some raw data which I turn into a PNM image). It'd be
> very
> useful to inspect individual pixel values all over the image. I can
> sort-of do it via kruler but having to move the ruler around is tedious &
> slow.
>
> Thanks!
>
>

It's easy, I guess ;-)

I'm doing this with gimp-2.6.8.

1) press O (the letter O) and you'll get the eye-dropper / Color Picker.

2) Find the tool options... It might be on the toolbox. Once you have the
'Tool Options' read the menu until you find 'Use Info Window.'

3) Check your window for the 'Color Picker Information' window, which may be
hidden under other stuff on your desktop.

4) If you cannot find Tool Options, then look under the Window Menu Item
and click on 'Dockable Dialogs, ' and then click on 'Tool Options,' which
will be the first item on the dropdown list.

5) This should help, but if not, come back and report your problems.

John.

--
Using the Cubic at home.

[John K. Herreshoff]

John K. Herreshoff wrote:

And on ooops on my part: click on a color with the 'eye-dropper' to
activate the 'Color Picker Information' window.

[A. W. Dunstan]

John K. Herreshoff wrote:

Got it! I had "Select by color" which let me select all pixels of a given
color (a useful feature in it's own right, at least for me) but that wasn't
showing the pixel value. Then I noticed that the cursor wasn't an eye
dropper - finding and selecting the eye dropper/color picker tool, setting
it to 'pick only' and turning on 'Use info window' did the trick.

Thanks - I've been looking for this off and on for months!

[ahromadka]

While the eyedropper info box works, it will always be changing your foreground color just to figure out what the pixel value is.

A cleaner alternative is the Windows --> Dockable Dialogs --> Pointer, which opens up a tab in the Layers/Channels/Paths dialog, which then is continuously updating no matter which tool is active, so it's always available, and no need to click/drag/eyedropper.