5.5.
Sample Points Dialog
While the Color Picker
can display color information about one pixel, the
“Sample Points” dialog can display the data of four pixels of
the active layer or the image, at the same time. Another important
difference is that the values of these points are changed in real time
as you are working on the image.
5.5.1.
Activating the dialog
The “Sample Points” dialog is a dockable dialog; see the
section Section 2.3, “Dialogs and Docking” for help on manipulating
it.
You can access it:
5.5.2.
Using sample points
To create a sample point, Ctrl-click on one of the two measure rules
of the image window and drag the mouse pointer. Two perpendicular
guides appear. The sample point is where both guides intersect. You
can see its coordinates in the lower left corner and the information
bar of the image window. Release the mouse button.
By default, this sample point comes with a round mark and an order
number. You can cancel these marks by unchecking the Show
Sample Points option in the View
menu.
The “Sample Points” dialog should automatically open
when you create a sample point. This is not the case; you have to
open it manually.
You can delete a sample point, as you do with guides, by
click-and-dragging it up to a rule. Order numbers are automatically
re-arranged in the dialog window; the most recent are moved one rank
up.
By default, sampling is performed on all layers. If you want to
sample on the active layer only, uncheck the Sample
merged option in the tab menu:
5.5.3.
“Sample Points” dialog description
The informations of four sample points are displayed in this window.
You can create more, which will be existing and not shown. To show
them, you have to delete displayed points.
The color of the sampled point is displayed in a swatch box.
In the drop-down list, you can choose between:
-
Pixel
-
This choice displays the Red,
Green, Blue and
Alpha values of the pixel, as numbers between
0 and 255.
-
RGB
-
This choice displays the Red,
Green, Blue and
Alpha values of the pixel, as percentages. It
also shows the hexadecimal value of the pixel's color.
-
HSV
-
This choice displays the Hue, in degrees, as
well as the Saturation,
Value and Alpha of the
pixel, as percentages.
-
CMYK
-
This choice displays the Cyan,
Magenta, Yellow,
Black and Alpha values
of the pixel, as percentages.
Data are supplied for every channel in the chosen color model. The
Alpha is present only if the image holds an Alpha channel.
Hexa appears only with the RGB mode. That's the
hexadecimal code of the
HTML Notation.
