From 698569f8428ca088f764d704034a1330517b98c0 Mon Sep 17 00:00:00 2001 From: tpearson Date: Sun, 26 Jun 2011 00:41:16 +0000 Subject: Finish rebranding of Krita as Chalk git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/applications/koffice@1238363 283d02a7-25f6-0310-bc7c-ecb5cbfe19da --- doc/chalk/using-selections.docbook | 200 +++++++++++++++++++++++++++++++++++++ 1 file changed, 200 insertions(+) create mode 100644 doc/chalk/using-selections.docbook (limited to 'doc/chalk/using-selections.docbook') diff --git a/doc/chalk/using-selections.docbook b/doc/chalk/using-selections.docbook new file mode 100644 index 00000000..675088ec --- /dev/null +++ b/doc/chalk/using-selections.docbook @@ -0,0 +1,200 @@ + +Selections + + +This chapter gives a short introduction on selections. + +You can select a part of an image masking off the rest. This is handy when +you want to cut, copy or just modify a part of the image without affecting +the rest. For processing selected objects &chalk; applies a mask. Each pixel of +the selection is processed based on a value of its mask, or the level +of the selection, that can range from 0 (unselected) to 255 +(selected). Yes, that is right, you can have fractionally selected pixels. +And by working on individual pixels you can paint your selection. + +The selection mask is visualized with unselected pixels having a blueish +tint, and selected pixels looking like normal. Fractionally selected pixels +are shown as something in between. Additionally a red border is drawn around +the selected areas. Fractionally selected pixels are inside the border, so +even inside the red border you can possibly see the blueish tint on some pixels. + + + +Making a selection + +A whole range of tools exist to make selections. From rectangles, ellipses +and freehand to the more exotic like color range select. When you make +several selections they add up. So a rectangle select followed by an +ellipse select select both areas. Later on, you can subtract areas from +the selection by using, for example, the Erase Selection tool. + +To get back to normal (no active selection), choose +SelectDeselect +. To select all pixels, choose +SelectSelect All +. + +You may think that those two actions give the same result, but it +is much more efficient to have no active selection than to have selected +everything. + +After having deselected you can bring your selection back by choosing +SelectReselect +. + + + + +Painting your selection + +As said above you can essentially paint your selection, and just like +when you paint normally you can choose to paint your selection freehand or +guided with rectangles, ellipses, &etc;. You also have the choice of different +paint tools like pen, brush, airbrush, &etc;. Choose the guide tool, and the +paint tool in the toolbox, and go ahead and paint your +selection. + +The guide tools work just like you may be used to from other applications. So +holding down shift while drawing a rectangle or an ellipse still forces them to +be a square or a circle respectively. + + + +Painting a selection + + + + + +Painting a selection + +Painting a selection + + + +Painting a selection + + + + + +Painting a selection + +Painting a selection + + + + + + +Unselecting + +All the selection paint tools have an option to add or subtract from the +selection. This means that you can use all your familiar tools to both select +and unselect. There is also a true selection eraser among the selection paint +tools. + + + +Unselecting + + + + + +Unselecting + +Unselecting + + + + + +Making a new selection + +When you want to make a new selection, replacing the currently active one, you +first need to deselect the active selection. Choose +SelectDeselect +. + + + + +Selecting a contiguous area (magic wand) + +To follow the analogy of painting your selection &chalk; also provides an +equivalent to filling a contiguous area. Some paint applications call this +selection tool the magic wand tool. What it does is select the nearby +pixels as long as they have nearly the same color as the pixel you click +on. The selection floods out from the point you click on. In the fuzziness +option you can set how different the colors are allowed to be before the +flooding stops. + + + +Before the magic wand + + + + + +Before the magic wand + +Before the magic wand + + + + +A magic wand selection + + + + + +A magic wand selection + +A magic wand selection + + + + + + +Selecting similar colors + +The Select Similar tool lets you pick a pixel and then select all pixels that +have a similar color. Picking a color in one corner of the image may select a +pixel in another corner if they have similar color. +With the Fuzziness option you can set how similar the colors must be to become +selected. + + + +Selecting similar colors + + + + + +Selecting similar colors + +Selecting similar colors + + + + + +Inverting the selection + +In some cases it is easier to specify your selection the other way around. That +is, first you select the parts that ultimately should not be selected and then +then you choose +SelectInvert +. +What invert does, is that for every pixel it flips the selection level so to +speak, by setting it to 256 minus the current selection level. Thus what was +selected becomes unselected and vice versa. + + + + -- cgit v1.2.1