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Selection

Jun 7, 2014, 16:48
Post: #1
Selection
I am wondering how to select a portion of the image as a rectangular selection and do something with it. The selection editor does not seem to include any relevant options can you help please?
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Jun 7, 2014, 17:48 (This post was last modified: Jun 7, 2014 18:00 by rich2005.)
Post: #2
RE: Selection
The selection editor mainly shows the active selection, there are a few operations below the dialog, invert, selection to path etc. All these are available in other gimp menus if the selection editor is not enabled.

Use other gimp tools on your selection, paint, gradient, pattern etc

[Image: f4OMbHB.jpg]

but not all at once Wink

edit: you did look at the gimp help pages on making selections yes/no
http://docs.gimp.org/2.8/en/gimp-using-selections.html

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Jun 8, 2014, 04:54
Post: #3
RE: Selection
Interesting, however, I only see this am I missing out on a version?

Screenshot
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Jun 8, 2014, 05:52 (This post was last modified: Jun 8, 2014 08:04 by Esper.)
Post: #4
RE: Selection
the selection editor, rich2005's screenshot shows, is under 'Select -> Selection Editor'
while your screenshot shows a saved selection in the channels tab

i had never seen or used the Selection Editor in my life, before i saw rich2005's post Smile
but i have used the 'Save To Channel' command (which is under 'Selection' as well) used a thousand times

firstly its good for saving a selection
remember selection tool can also be used in add and subtract mode, meaning you can add parts or subtract parts to a selection

but you can also use it as a bump-map (when blurred) for bumpmapping

and a saved channel is a very convenient way of initializing a layermnask from channel as a one click action

last not least the colour (and opacity) of the mask of your saved channel can be changed - sometimes thats helpful as a visual aid

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Jun 8, 2014, 06:04
Post: #5
RE: Selection
Thanks however I am not sure whether you understood my original question.

How do I make a selection and make a simple crop?
e.g. I want to make a selection (e.g. rectangle or other polygon) and crop that part of the image?
I might even want to make a selection out of a freeform selection or outline based on a portrait, is there some way to have GIMP automatically detect contours and outlines (e.g. a face in an image)?
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Jun 8, 2014, 06:35 (This post was last modified: Jun 8, 2014 08:07 by Esper.)
Post: #6
RE: Selection
if you want to crop an image with a rectangular selection, go to 'Image -> Crop to selection'

if you want to change a layer with any selection tool, make the selection, then invert and delete
if your layer has transparency (= an alpha channel) , your layer below will become visible, if not, it will be displayed as white (you can change that by adding an alpha channel: left click on your image -> Add Alpha Channel)

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Jun 8, 2014, 08:15 (This post was last modified: Jun 8, 2014 12:37 by ofnuts.)
Post: #7
RE: Selection
(Jun 7, 2014 16:48)jon80 Wrote:  I am wondering how to select a portion of the image as a rectangular selection and do something with it. The selection editor does not seem to include any relevant options can you help please?

In the general case, to create a rectangle selection, you don't use the "Selection editor" but the "Rectangle selection tool (Rectselect).

To crop the image or the layer to a rectangle, you can either crop the image/layer to the selection obtained above, or use the Crop tool (Crop), which is fairly similar to the Rectangle select, but the UI is more adapted to cropping (the remaining part contrasts more with the rest).

The "selection editor" is rarely used, since the only functionality you won't find anywhere else in the UI is the advanced (arcane?) parameters used to transform a selection into a path, but it looks like you are not there yet Smile In practice all selections are obtained using the "selection tools " (Tools>Selection tools, also the first icons in the tool box).

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Jun 8, 2014, 11:48
Post: #8
RE: Selection
@jon80: All of the above "tool" icon instructions maybe "null" until you have the toolbox window open.

If all you see when you open Gimp is what was in your screenshot...

1. In Gimp, click the "windows" menu, between "Filters" & "Help"
2. Then click "Toolbox"
3. You also might need to click "Toolbox - Tool Options" under that
Windows > Toolbox - Tool Options"

- The tool options / settings for each tool should show directly under the Toolbox icons.

The toolbox with the crop & selection tools & more should now show up.
.
.
If it still doesn't show, click to
Edit > Preferences > Windows Management

- Then click "Reset Saved Window Positions to Default Values"
Click ok.

"In order to succeed, your desire for success should be greater than fear of failure." BC
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