Don't buy books.
Read The Manual.
GIMP User Manual は頭から通読されることを想定して書かれている。 頭から読んでいないと、
Moving Grouped Layers: If layers are grouped (with the little chain symbol) they will all move, regardless of which layer is currently active.
と書いてあるところで「layer を group にする方法」が判らないという事態に陥る。 Grouped Layers って Linkage Layers のことかと気付くのにしばらくかかるとか。 ベジェとかフィルターとかそんなことは最後の最後でいい。 Layers, Selections, Move のコンセプトの理解が最優先。

Concepts: Layer (II 8.1.1)

Linkage to other layers: If you click between the eye icon and the layer thumbnail, you get a chain icon, which enables you to group layers for operations on multiple layers (for example with the Move tool or a transform tool).

Concepts: Move (III 13.4.3)

Moving a selection: The Move tool allows to move the selection outline only. If the Move Mode is “Layer”, you must hold down Ctrl+Alt keys. If the Move Mode is Selection, you can click-and-drag any point in canvas to move the selection outline. You can also use the arrow keys to move selections precisely.

Moving a layer: The Move Mode must be “Layer”. Then you can choose between Move the Active Layer and, if you have one or more layers, Point to Layer (or Guide).

Moving Grouped Layers: If layers are grouped (with the little chain symbol) they will all move, regardless of which layer is currently active.

Moving a text: Every text has its own layer and can be moved as layers. See Section 6.6, “Text”.

Concepts: Move Options - Tool toggle by Shift (III

If Move is on “Layer”:

Pick a layer or guide: On an image with several layers, the mouse pointer turns to a crosshair when it goes over an element belonging to the current layer. Then you can click-and-drag it. If the mouse pointer has a small hand shape (showing that you do not pick an element of the active layer), you will move a non-active layer instead (it becomes the active layer while moving). If a guide exists on your image, it will turn to red when the mouse pointer goes over. Then it is activated and you can move it.

Move the active layer: Only the current layer will be moved. This may be useful if you want to move a layer with transparent areas, where you can easily pick the wrong layer.

If Move is on “Selection”:

The selection's outline will be moved (see II 7.2.1, “Moving a Selection”).

Concepts: Float (III 15.4.5)

The "Select" Menu: Float

A floating selection (sometimes called a “floating layer”) is a type of temporary layer which is similar in function to a normal layer, except that before you can resume working on any other layers in the image, a floating selection must be anchored. That is, you have to attach it to a normal (non-floating) layer, usually the original layer (the one which was active previously), for instance, by clicking on the image outside of the floating selection (see below).

Important: You cannot perform any operations on other layers while the image has a floating selection! You can use various operations to change the image data on the floating selection. There can only be one floating selection in an image at a time.

Tip: If you display the layer boundary by using the Show Layer Boundary command, you may have difficulty selecting a precise area of the image which you want in a layer. To avoid this problem, you can make a rectangular selection, transform it into a floating selection and anchor it to a new layer. Then simply remove the original layer.

In early versions of GIMP, floating selections were used for performing operations on a limited part of an image. You can do that more easily now with layers, but you can still use this way of working with images.

Activate the Command: You can access this command from the image menubar through Select → Float, or by using the keyboard shortcut Shift+Ctrl+L.

Concepts: Selection (I 3.1)

If you need help with what a “selection” is in GIMP,
and how it works, see Selection.
“marching ants”

Selections: Often when modify an image, you only want a part of the image to be affected. The “selection” mechanism makes this possible. Each image has its own selection, which you normally see as a moving dashed line separating the selected parts from the unselected parts (the so-called “marching ants”). Actually this is a bit misleading: selection in GIMP is graded, not all-or-nothing, and really the selection is represented by a full-fledged grayscale channel. The dashed line that you normally see is simply a contour line at the 50%-selected level. At any time, though, you can visualize the selection channel in all its glorious detail by toggling the QuickMask button.

A large component of learning how to use GIMP effectively is acquiring the art of making good selections—selections that contain exactly what you need and nothing more. Because selection-handling is so centrally important, GIMP provides many tools for doing it: an assortment of selection-making tools, a menu of selection operations, and the ability to switch to Quick Mask mode, in which you can treat the selection channel as though it were a color channel, thereby “painting the selection”.

Concepts: Floating Selection (II 7.1.2)

For complex selections: use Selection → Floating
to create a floating selection.

This creates a new layer with the selection
called “Floating Selection”. 

Read Official User Manual!

Official Handbook "GIMP User Manual" をがしがし読むのが王道。ここを読んでわからないなら、どんな本を読んでもわからない。

Project: Own Gimp Manual (OGM)

ほんとうに必要な事だけ集めた自分だけのマニュアルを作ってみるテスト。 ベジェなんて、フィルターなんて、結局使わないですから。
Select Float
Select by Color
Float Layer
Move Layer
Anchor Layer
Move Grouped Layers


これを check するかどうか大問題!
Preferences > Tool Options > Move Tool

Set layer or path as active: [no check]

(If enabled, the move tool sets
the edited layer or path as active.
This used to be the default behaviour
in older versions.)

Move Layer

Move the active layer: shift drag
Pick a layer or guide: drag (ここ鬼門)
とにかくまず shift 押す!

Moving Grouped Layers

If layers are grouped (with the little chain symbol) they will all move, regardless of which layer is currently active. Grouped は Linkage のことね。

Books about GIMP

Don't buy books. Try to read instead "Gimp User Manual" by K. Kylander & O Kylander.

大昔に The Artist Guide to the Gimp を買ったきりギンプ本はなにも買ってない。 バイブルの Gimp: The Official Handbook は、 オンラインで読める The Official Manual "Gimp User Manual" があればいらない。


first posted: 2011-12-30 21:11:30
last modified: 2012-01-01 15:17:35