GIMP :: Deleting Selection From Image After Saving To Channel?
Sep 10, 2013
I made a complicated selection, which I saved to a channel. Then I inverted the selection and tried to delete the inverse (hopefully to transparency, but deleting to a background color would be better than not deleting at all). However, nothing happens when I press the delete key, or when I select "Clear" from the edit menu. Trying to use the Cut command doesn't work, either.
After deselecting, I can get the selection back through the channels dock, by right-clicking and then choosing "Channel to selection" or "Add to selection." It appear to replace the selection from the channel properly. I just can't delete anything.
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Dec 12, 2012
I have removed the background from a photo using selection deleting to transparency via alpha channel. My dog was left. I then exported to png. When I try to upload the dog to use in a label, (Open Office), the back ground turns to white.
What am I doing wrong?
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Nov 9, 2013
When I try to save a selection to other than a New channel, the Save Selection box only allows saving to a New channel and grays out the other options. How do you save a selection to another channel and/or activate the other options?
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Mar 20, 2013
I thought that I could just use Quick Mask to manually paint with 100% black or 100% white to adjust the boundaries of the selection and then save that final selection as my alpha channel.
However, I'm discovering that when I do this, I end up getting a weird grey-ish artificat (which incidentally, I can't figure out how to remove it). How I should be properly modifying the selection prior to actually saving it.
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Mar 21, 2012
I have a B&W images. It's actually in RGB but all shades are gray. I would like to create an alpha channel whose values equal the brightness of each pixel. How do I do that?
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Jul 24, 2011
Thought I'd try Gimp on my new laptop instead of Photoshop. I'm making graphics for a game.
I needed to add an alpha channel to an image and edit it, including pasting into the alpha channel from the clipboard. Easiest thing in the world on Photoshop, but seems utterly impossible on Gimp.
I've looked at a few threads that discuss editing the alpha channel, and they make it sound like rocket science. Notable, most seem to involve juggline multiple other images and then following convoluted pasting operations to get anything down. Or using layer "Masks" which, as best I can see, are impossible to paste into (and I couldn't find how to convert these masks to alpha channels either.)
As it stands, I've failed to get anything onto an alpha channel at all, except some scribble that showed up in the tiny side icon but couldn't be seen in the main image.
I'm new to Gimp, and I'm hoping I've just missed something. What is the straight forward way to edit the alpha channel (drawing on it, pasting into it from the clipboard), and seeing the results at the same time. I've tried everything intuitive and nothing works.
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Jun 6, 2011
In short, I have two images open in Gimp. I need to add one the images to the alpha channel of the other image. How do I go about doing this? I was able to add an alpha channel but beyond that I am lost.
This bit will only make sense to 3D modelers. I have 3D model that I'm importing into a the Unity 3D game engine. One of the material shaders makes use of specularity maps. Normally the specularity map would reside in the alpha channel of the RGBA diffuse image, but due to file sizes, all these are released as separate jpegs. The idea is to make some parts of the 3D model more glossy as far as I know. The only way to do this is to add this specular image to the alpha channel of the diffuse image, and then the game engine can work its magic, making the skin look realistic.
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Jul 27, 2011
I have an existing (grayscale) image that I want to make into the alpha channel for another image.
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Oct 21, 2012
Is there any way I can directly make a grayscale image into an alpha transparency channel?
I mean, NOT involving selection? Because selection by color to layer mask,is really difficult what I need to do the selection threshold.
Why is it easy to turn an alpha channel into a grayscale image but not the reverse?
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Dec 15, 2011
I already have an image file in png format..which I want to use as an application launcher icon for my android application.
The android specifies image with following properties for the launcher icon(Will need 4 different image to support different screen size in mobile devices)
Launcher icons should be 32-bit PNGs with an alpha channel for transparency. The finished launcher icon dimensions corresponding to a given generalized
Screen density are shown in the table below.
1. 36 * 36 px
2. 48 * 48 px
3. 72 * 72 px
4. 96 * 96 px
I would like to create 4 png files(with specifications mentioned above) from the already existing image file. How do I do that in GIMP.
I am completely novice to image editing(Never touched any image editing software before) and not sure how to achieve this in GIMP.
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Apr 20, 2012
There seems to be tons of threads on how to make a transparent image, but I haven't been able to fine one to do one specific thing.
How do I set the alpha channel to be black? I want to have a black background on a png file, but I need the black to be transparent to things behind it on a webpage.
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Apr 28, 2011
I have a nice image that has lost the red channel histogram data for about half of the image. It can still be viewed, and the preview is correct.
Can I copy the histogram data from the red channel of the non-corrupt portion of the image? I know it's the red channel because when I open the color data from the corrupted portion the red channel is literally non-existant.
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Nov 27, 2013
The problem is that if one has defined a selected area in an image, using either selection by color or contiguous selection using the 'magic wand' facility, is possible to copy this selection to the Image Map facility of the image, so as to automatically define a set of coordinates as a polygon that can be used for link purposes? Perhaps there is some interim step that is required, or perhaps a special script is required?
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Mar 13, 2011
I managed to remove the background, of an image,(A whit background) and put the image on top of a transparent layer. made a transparent image. When I place this image over a light color background, it looks fine, but when I place it over a dark color background, the edge of the image looks very rough and dirty, I think it's because some of the anti alias from the original image, how can I make it a clean image without going to delete pixel by pixel?
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Jan 4, 2014
I need to add a border to an irregular object. I want to add a simple line around an object, with about 5 pixel space between the line and the object. How would I do this? Basically, I want to achieve an effect like the image below with the lines around the border of the land at the sea.
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Oct 26, 2012
I'm a former Photoshop user. The reason I no longer use it is because of a silly misunderstanding with the NSA and MI6. But hey, that's the past and I'm a believer in moving on.
Anyway, my first inquiry here is a simple one having to do with selection. When I used PS I would at times use the wand selector and then open a new file which already had the dimensions of the selection. Thing is, when I select something in Gimp and open up the new file it still has the same size as the main image from which an area was selected, i.e., if the main image was 500x500 and I selected something 100x100 the copy was still 500x500.
And I can assure you it has nothing to do with remote viewing and foreign embassies.
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Jan 29, 2014
I need to assemble multiple images in an illustration program (inkscape or illustrator for example). So I want to cut and paste several regions from different images, but I want them to all be exactly the same size. What I had been doing in photoshop was just dragging the selection from one open image to the other and that would preserve the size so I could copy again, but that doesn't seem to work in GIMP, or rather, nothing I tried seems to work.
How can I get a selection to be identically sized between different images without actually moving any part of the image itself?
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Nov 16, 2013
I am using a macbook pro. Every time i go to export an image I have resized, or modified, the name field does not let me use most of the keyboard. Some of the keys work but most dont in that field.
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Mar 7, 2012
This keeps happening where I have an image, I edit it, I press ctrl+S, but when I upload the image the edited version is not uploading the original version is?? I have to save it as ctrl+shift+s. This sucks because now I have 3 or 4 of the same image all saved differently which gets to be pretty inconvenient.
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Jan 24, 2013
In Photoshop, when I make a selection of an image, the rectangle selection tool stays within the bounds of the image (layer). I would like to do this in GIMP, but the selection is allowed to extend beyond the photo, and basically select blank space.
Basically, I would like to do this so that I can have a fixed ratio box and be able to move it to the very edge of the image without having to worry about making sure the cursor lands exactly on the edge. I'm sure it is a simple option to select somewhere
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Aug 2, 2013
I want to crop several images in same aspect ratio.So I checked "Fixed" option and set proper values in tool box.
And sometimes I want to complement image with background color if selectionis larger than original size. In this case, I add a larger layer bottom of the image and crop it.
But it would better if I can do it by one action.Therefore I'm trying to write a script-fu for it, but I'm stuck now.
Because a function `gimp-selection-bounds` returns points only inside ofthe image even if the selection is outside of image.
Is there a way to get bounds of selection outside of a image by usingscript-fu?
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Jun 5, 2013
I am trying to select the aplha channel (and make it a selcetion ) by using the command +mouse click but I only get the black selected not the white. So i have to invert selection, which is annoying. Am i missing something? this worked 2 weeks ago and now it has changed.
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Sep 4, 2011
im making an animation with gimp and then i saved it. but now i want to add more layers and paste these images on buuutt when i paste the colors are all faded and weird, does this have something to do with like indexed images or something?
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Sep 20, 2013
As a recent user of Photoshop, I need to attach details such as keywords to an image. This will usually be a TIFF or JPEG.. I'm new to Gimp but see in the Properties category I can enter the sort of info I want but when I try to save everything this info just disappears and obviously is not embedded in the file.
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Jun 1, 2012
CS5, OS 10.6.6, 2.93 GHz Quad Core Intel Xeon
Making a mask from a selection the not-selected area is 95% black, not 100%.
So the not-selected area IS affected if the mask is applied, say using an adjustment layer.
Is there a preference somewhere, or a key command that was inadvertently applied?
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Dec 23, 2012
I have photoshop cs6, and I was just wondering how to save a selection in channel mode.
So for example (below), If i wanted to only copy the part of this picture that has white and the plant in the picture how would i do this? I've tried colour range but it didn't work so I am very stuck.
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Oct 30, 2011
I've come across a weird problem. Whenever I select a channel in the channel box ("Translate X" for example) it is immediately unselected. This prevents me from selecting a channel and middle-mouse dragging in the viewport to adjust its value.
This only happens in particular scenes. But if I start a fresh scene, I do not have the problem. Is there a button somewhere that I need to deactivate to fix this?
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Sep 17, 2012
GIMP closed while I was in the middle of saving an image and is now telling me that the xcf is corrupt and that there is no usable data in it even though the file is the same size as it was before the crash. This is the third or fourth time it's done this to me. I'd include the file but this is the first time I've posted here and I don't know how
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Aug 15, 2013
you've zoomed in to start this painstaking freehand selection withlots and lots of points, and when you get to the end, nothing getsselected. Then you notice that, once again, you had done a Select Allsome time ago (invisible because you zoomed in) and forgotten to SelectNone before clicking the lasso.
What do people do to avoid this? (I know the obvious answer is "rememberto check what your selection is all the time", but that's seriouslyflow-disruptive.)
GIMP could blink the image or something when you add selectionpoints that don't increase/decrease the already selected area, but Iguess that might take some time to implement.
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Mar 20, 2013
I have a series of files in which I improperly modified the selection set prior to saving the selection, and now around the intended viewable area there is a hazy artifact that seems to correspond to where I manually edited the selection using Quick Mask (prior to saving).
In other words, within the area of the alpha channel that should be invisible, there is actually a visible, unwanted grey-ish artifact, and I think it's related to how I was using the brush to edit the selection in Quick Mask before saving.
Now I am unable to edit the alpha channel, although Adobe's own website says that in order to edit an alpha channel, all I need to do is select the alpha channel (which I am doing) and then paint at 100% black or white with a brush to either include or exclude parts of selection set.
When I choose the brush and start painting at 100% black or white, nothing happens and I can't figure out what is happening.
The exact steps that I'm taking are below:
1) click on alpha channel (visible and ready for editing), all other channels only visible not active.
2) selecting the brush at either 100% black or white
3) attempting to paint to alter the alpha channel (I've tried painting on the actual alpha channel in Channels, and I've tried painting on the alpha channel as it appears in Layers, and neither works for me).
CLARIFICATION:
I actually am able to "edit" the alpha channel HOWEVER I cannot remove the hazy artifact. I can use 100% black or white to remove the pink/light red areas on either the actual alpha channel (in the Channels area) or as it appears in Layers, but I cannot remove the areas that are grey-ish (well I can paint them white but I can't paint them black, i.e. fully pink).
A teacher showed me a quick fix process that basically involves activating the alpha channel, inverting the selection, and then deleting everything outside of the alpha channel, and then resaving the file. That worked at one point, but now that quick fix is not working either (I am just ending up with a completely visible, white space around the intended visible area, rather than an invsible area).
EDIT (07:22 3.20.13) Also, if you look at what Photoshop is registering as the actual alpha channle, it doesn't match with what I'm seeing above, that is the black and white alpha channel appears to be as expected, and there is not the weird distortion that I'm seeing above in the pink/grey image.
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Sep 12, 2013
I have a selection in a Photoshop RGB document. I would like to add a constant value (say +16, for example) to all of the red values for each pixel in the selection.
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