Photoshop :: Adding Constant To One Channel For All Pixels In Selection?
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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Jul 22, 2013
1.I am working on a project where I need to set all pixels below a level as alpha channel, is there a quick way to achieve this? The level can be both set a prior or adjusted dynamically, the second way is preferred. Right now my workflow includes:1. duplicate layer.
2. use color level in duplicate layer, in menu COLOR -> LEVEL.
3. add alpha mask to original layer
4. copy duplicate layer into the alpha mask of the original.
5. delete duplicate layer.
6. If result is not ok then return to 1.As you can see this workflow is a headache, specially point 6 which is often achieved.
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May 11, 2013
Firstly, what does a person do when they need 57 channels (56 being the top limit)? I am sure that large projects go OVER 56 channels. I can't be the first person to ask about this issue, yet I can find nothing on "the 57th channel."
Secondly, why is there (what seems to be) an arbitrary limit of only 56 channels?
No place can I find details about the 56 channels, and how to deal with when you need more channels.
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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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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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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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May 21, 2006
i have many bitmaps...i was wondering if there was some advantage to having a bitmap when enlarging and adding pixels.......
also Genuine Fractals is still better than cs2 for this,
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Apr 29, 2013
The issue:When I ctrl+alt+right-click to select a layer, I can click the actual layer, or about 6 to 10 pixels below the layer. This latter option (the 10 pixel margin thing) is rather annoying when there's a layer below it, that happens to stick out 10 pixels underneath that layer.
It basically requires me to set the higher layer to invisible, and then rightclick again.There's a slight difference between pixel layers and vector layers, as vector layers seem to have a bigger "hitbox" than pixel ones.
The most annoying instances are layers with, for example, a one pixel line. You pretty much have to *guess* where to click, as everything is so close to eachother.I work in webdesign, and am working with pixel-perfect designs all the time, so this is something I deal with on a daily (read: every few minutes) basis.
My version of Photoshop
- CS6, update it frequently on my home PC & Work PC
It's worth mentioning that I didn't have this issue before CS6, and have been using PS for about a decade, +- 30 to 50 hours a week!
Before you claim it's the computer, the systems I've noticed this on:
- My home PC (16gb ram, couple SSD's for scratch disks, GTX670, core7 etc)
- My work PC (16gb ram, no scratch disks or fancy gfx card, core7 as well)
- Girlfriend's MacBook pro
- Her Mountain Lion running desktop (custom build, hackintosh)
+ several other PC's at work (programmers running wildly different systems and OSes)
We have several Adobe subscriptions; I have one, my girlfriend has one and at work we have about 3 or 4.So, it's probably not the computers.
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Jan 2, 2013
Is there a 'Load channel as selection' icon in Photoshop Elements 11?
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Jul 22, 2013
Title says it all. How to find the size of a selection in pixels in CC
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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 24, 2012
i'm not good using photoshop, i just installed the pre realease cs6 and trying to find a way of shrinking the marquee selection by certain amount of pixels from the selection border i found expand selection but it doesn't allow me to type nigative value
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Oct 4, 2013
Does content-aware fill use the pixels outside the selection ... or it uses only the pixels inside the selection?
I tried it with different photos, but can not be sure how does it work?
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Nov 21, 2012
This question is more theoretical, as I have found a work around. On a layer, I have a gray color, which I sample, and it becomes the desired Foreground color.
I would like to Fill a Selection in an Alpha Channel with this gray color.
However, when I view the Alpha channel, my forground color is lost to black/white, which I understand, as the Alpha channel is a gray scale image.
But, I am able to sample a gray Swatch to make a Foreground color, but how can I preserve my chosen Foreground gray selected from a Layer? The only way that I know would be to make a new Swatch, and then use that when I am in Channels.
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Jun 28, 2013
I am making selections of models off of a white background. I use the quick select tool and refine to make a clean selection. I go in and use the clone tool to remove the "halo" that is still there to make a super clean selection with no light bleed on the model. I put a black layer underneath to make sure that I got all of the remnants. I save the selection and turn it into a channel. I apply the layer mask and everything looks good. I flatten the image and put it on a white background (this is the desired form of delivery for client) Image saved and closed. When reopened, I make a selection using the channel and there is a distinct halo effect still present. I have tried making the selection and going over it a couple times with the brush at 100% and it works a little bit, but not entirely. I have already spent a lot of time going through cloning things out so it looks good, delivering the images, then they are sent back because of the halo.
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Mar 7, 2013
My link but when I get to the part where it says to add the alpha channel - add alpha channel is greyed out in gimp.
I'm using Gimp 2.6 - windows xp.
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Jan 15, 2014
what I have been doing to work with transparency: bring up GIMP to add an alpha channel and set part of an image to transparent. Save and use in Paint.net.Today, for example, I wanted to create a M + W logo, and the result looked like this:I set the font to Engravers MT, put a red W on an image.Selected "All", copied to clipboard, then pasted to a new image.Vertically flipped the new image, making it an M, changed color to blue using Recolor tool. Saved it as PNG, closed image.Started GIMP, opened the blue M image.On GIMP menu, selected Layer --> Transparency --> Add Alpha ChannelUsed Fuzzy Select Tool to select the area outside the blue MHit delete key to remove color of fuzzy selection (converting it to transparent)Save image as PNG and exit GIMP.Back in Paint.net, open the M image.Select All of Image, copy to clipboard.Paste into New Layer of W image.Adjust position of this transparent selection layer to achieve desired resutl as above.Save the completed image.I find GIMP to be very hard to work with, and prefer working with Paint.net. It would be so nice to be able to create an alpha channel and make a transparent area of an image inside of Paint.net.
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Feb 20, 2012
is there a way to know how many pixels my selection has?
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Feb 8, 2009
Everytime I try to cut something it says
"Warning: No pixels are more than 50% selected. The selection edges will not be visible."
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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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Jul 26, 2011
When I use the feather function in Ps, does the feathering start from the point of my selection (marching ants) outward to the designated number of pixels, or from the marching ants inward, or half and half, or what?
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Jul 21, 2011
I use Paint.NET for cut background from photos of Mask for this nice project: Masks In photoshop i can use expand selection for cutting 1 pixel more then i just selected. In Paint.Net i usualy skip this step and images has white/black thread around the mask.
Example: [URL]...
How to correct this problem, is there way to expand selection for 1-3 pixels ?
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Oct 6, 2008
How do you see the size of a selection (in pixels?). In Photoshop this would be in the info dialogue window. I'm not finding the equivalent in GIMP (2.6).
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Aug 24, 2012
Whenever I use the Crop to Selection tool (with a rectangular selection), it doesn't actually crop TO the selection, it usually leaves an extra pixel on two edges.
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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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May 12, 2012
Why does adding a FX (Distort - Ocean Ripple) to text (converted to outlines) or a basic shape, change it back to pixels and blocky? Why doesn't it stay as smooth bezier curves? Is this a possible bug?
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Aug 13, 2011
Using the below steps causes a string of pixels to delete, and forum I visited [URL]..... with similar issues think it's a bug in PaintShop Photo Pro X3 13.0.0.253. I now have version X3 - 13.2.1.20 after updates.
1. Start a new image, with solid background.
2. Selection tool, rectangle, add/shift, feather 0, anti-alias on.
3. Draw out a 3" rectangle. Flood fill or paint in the shape with a solid contrasting color. Leave shape selected.
4. Go to Edit, Copy.
5. Go to Edit, Paste as transparent selection.
6. Place the copy to the right and up against the first shape.
7. Go to selections, Select None.
Take note that there is a string of pixels that is being removed. The above steps were posted by my peers in the PaintShop Photo Pro community forum I mentioned above.
What I’ve been trying to do is Paste As New Selection from one image into another, and pixels are cut off once I click to release the selection. I’ve tried different things, like expanding the canvas of the pasted image, and other things, but nothing has worked.
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Aug 21, 2013
Wether it's possible to spread the pixels colors considering the normal vector of the selection curve ?
I post an image that would be the approximate result of what i imagine.
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Sep 23, 2013
When adding/subtracting from an existing selection I often use the wrong option in the selection module in the tool bar. I understand the theory behind the selection process in principal. However, I often end up doing the opposite. Any technique to add/subtract from an existing selection that is more effective than using the instructions suggested by the software help menu.
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