Photoshop :: Select Pixels By RGB Values?
Feb 26, 2006
I have a portrait shot on a grey cloth background and I need to remove the grey background.
Replace color is useless, as is the magic wand.
However the BG is comprised of pixels that are all VERY close to neutral ie
Red -231
Green - 232
Blue - 231
etc
I am trying to find a way to select only those pixels that are within 1 or 2 from the other components, ie it would select for the above selection:
Red - 230-232
Green - 231-233
Blue - 230-232
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Feb 26, 2013
GIMP 2.8.4 Windows 7 64-bit
Using the native GIMP rotate function to rotate a rectangular image about its center (for instance) the corners of the image which are exposed by the rotation are set to RGB 0x000000 with an alpha value of 0.so that these areas are transparent.
If the same operation is performed as a GEGL operation the corners have RGB values of 0x000000 but alpha values of 255 - i.e. they are solid black.
Is there a setting to cause GEGL to use alpha values of 0 for these pixels? This also applies to GEGL operations such as shear.
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Feb 12, 2013
I opened a transparent PNG and exported the PNG to another file and unchecked 'save color values from transparent pixels' but about 20% of the color values in transparent pixels STILL remain in the picture when viewed in other programs that show those pixels!!! Gimp is NOT removing ALL color values in transparent pixels!
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Jul 10, 2013
If I shoot 2 different portraits (of 2 different people), against the same background (a complex one not a backdrop), using a locked frame on a tripod, giving me the same exact background in both pictures, with only the portraits changing.
If I then take these 2 pictures, and create layers out of them in the same Photoshop document, and align them perfectly on top of each other.
Is there a way (action, plugin, script, etc...) to select the pixels that did not change between the 2 layers? In other words, the pixels that create the background of both pictures? And would it make it easier if I shoot the background alone, and then the portraits, and then follow the same steps?
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May 1, 2013
In some CS6 PSD documents (but not all), when I Select All (no feather) and then Copy, the result in the clipboard is one pixel smaller in height than the original—the bottom row is missing. This is verified by pasting, selecting the layer's contents, and reading the Info window, or by starting a new document which defaults to the clipboard image's size. One pixel too small. In addition, when I paste on top of the original (which usually my intention) you can see everything shift up by one pixel. (Showing that the image has been cropped at the bottom, rather than scaled.)
I am viewing everything at 100%.
Any guideline as to when this bug does or does not happen? I can't find a pattern--maybe it's any Copy that can fail and not just Select All? It seems like it may happen on a previously-scaled document (which I know messes up the text tool semi-permanently). But I hate having to go through the extra step of double-checking the dimensions of every single copy and paste. I'm really trying to get somewhere near my old CS3 productivity, but it's a struggle with all the new bugs!
(This is different from the bug where rectanbgular selections loose one pixel of vertical when you release the mouse button at 100% zoom, although it does sound related. That longstanding bug happens 100% of the time, but at least you can see in the Info box that it has happened—one more constant act of double-checking that PS6 work seems to need. Whereas in this bug, the Info window shows the correct full size of the document after you Select All—but when you Copy, the result has lost data.)
I see now that in the same document, something similar also happens when I simply flatten the document: a single-pixel row turns white... but at the top.
Flattened/background layers seem to be immune from the copy/paste height loss, so I thought I'd just flatten the image I want to copy... but the flatten itself loses data.
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Mar 9, 2014
I have a photo open in Expert with a blank layer above it. I selected the quick selection tool and drew a complete circle around the object I want to copy from this photo and to paste the selected area to the layer. However, I get a pop up box stating that the copy command cannot be completed because no pixels we selected.
I followed book and online instructions on selection tool uses while in Layers and can't seem to get past this pop up box.
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Jun 18, 2012
How can I select ALL non-transparent pixels from a layer?
- Ctrl + click doesn't work (it seems to have a 50% tolerance - my opacity 7% and 40% pixels don't get selected);
- The magic wand tool with 0% tolerance does work (when I click on a transparent pixel it selects ALL opacity 0% pixels around it and then I just have to inverse selection), BUT my image has a lot of holes with transparent areas and selecting them one by one would be tedious.
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Jul 3, 2012
I have been using CS6 for a while now and one problem that I keep encountering is the auto-selection of shape layers. Trying to auto-select a layer that's within 10 pixels of a shape layer is impossible without having to zoom in. This is a little hard to explain without images... Cue image...
If you try to recreate the above image, where the black 20x20px rectangle is a shape and the red 38x38px rounded rectangle is rasterized pixels, you will see that auto-selecting the red rounded rectangle is impossible at 100%.
Is this intentional and just an issue for me? Selecting pixel layers in CS5 was never this annoying. It seems that shape layers have an invisible 10px area around them stopping you from selecting anything below them. This is so frustrating with pixel UI work.
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Mar 24, 2013
I've managed to pixelate an image down to 128x128 pixels and have the amount of colours to 64.
However, I'm trying to get it that when I select a coloured pixel that all the other pixels of that colour are highlighted.
The magic wand seems to be the sort of tool I need but it highlights all colours/pixels that are similar; I want all pixels that have the exact RGB as the pixel selected.
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Mar 28, 2012
I was using Paint.net but I've found it too limited. The GIMP has much more power and I can do a lot more with it, but I've found a few things I can't figure out how to do.
For example, when I use the Eyedropper tool () to choose a color, GIMP doesn't seem to include any transparency in the selection:
The Colorpicker just chooses the color at 100% opacity. Is there any way to change this so that my new foreground color includes the transparency level?
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Jun 17, 2012
I need to wright a routine in autolisp that selects all 3Dpolylines with the same vertex Z value.Qselect as no transparent mode and filter doesn't work.
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Sep 12, 2013
The entire image is what is blinking, while the photoshop tools remain on.
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Sep 12, 2005
If I am constantly making frames in photoshop for use in the video world (ie. They will be on TV) the pixels need to be rectangular (or 4x3) in aspect and not square.
I know in programs like After Effects and Combustion you can set when saving an image whether or not it is square or rectangular pixels.
How do I do this in Photoshop if it can be done?
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Mar 15, 2013
I'm trying to show, using the eyedropper tool, the actual values of pixels in an 8-bit grayscale image (Mode command confirms that's what's there). In the Info panel, the eyedropper tool displays percentages for every type of color information (K, CMYK), while the "8-bit" field remains blank.
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Oct 15, 2012
2 days on GIMP. I need to adjust the clone tool so it's 1080 pixels vertical and about 20 pixels wide. I googled and searched, but I can't seem to find the right phrasing.
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Feb 5, 2013
I have several layers in an image, and I need to align them precisely. The ordinary layer shift ("move pixels") by multiples of pixels is not sufficient. Is there a tool or plugin for PDN that allows sub-pixel shifts (i.e. moves by fractions of pixel)? And rotations by very small angles?
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Jul 18, 2013
I have an attribute blocks and this att block has two tag values , is there a simple code for to change 1st tag values automaticly according to 2nd values ?
for example :
1st tag (50x50) - 2nd tag ( 100 ) ==> 50x50-100
if i enter 201 valuse to 2nd tag then 1 st tag has to change as 100x100
if i enter 501 valuse to 2nd tag then 1 st tag has to change as 150x510
I attached a jpg file for explain much better
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Dec 6, 2012
I've just started using Xara to edit my photos. I have a problem I can�t solve: how can I export the edited photos with 72 dpi and 843*403 pixels;or 72 dpi and 404*404 pixels?
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Apr 18, 2013
Is there a way to have no layer value set for the description keys. I set all the layers, and now I realize I'd rather set this to no layers (boxes are all unchecked). I'd rather see no value under the layer column, but there doesn't seem like a way to set this.
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Dec 21, 2012
Can AUTOCAD sum values that are entered as text values? Attached is a table text whose right final values should be all sumed up? Is this possible inside AUTOCAD?
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Jun 18, 2013
I know this discussion title is a bit murky, but the problem is a bit odd. I have Photoshop CS6 v13.1.2. In this version, I will activate the Select Tool, check Auto-Select: Layer, check Show Transform Controls, and then while using the Select Tool I will drag to create a rectangle to select multiple layers with content within the specified area.
Unfortunately, this action only works when I begin the selection from outside of the canvas area. If started from within the canvas area, no rectangle will appear, it will show me a measurement of my selection size, and then no layers will be selected upon release.
This cannot be working as intended right? I mean multi-select dragging cannot be intended to only work when started outside of the canvas right? Is there some way to fix this issue? Is this a bug? See the images below for more information on this issue.
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Dec 19, 2012
I work with shapes all day designing mobile apps. Thus, I'm constantly selecting and resizing rounded rectangles. When resizing I have to individually select all four points of a side to move it without distorting the rounded corners. I cannot click and drag, because that will activate any shapes underneath the one I want to select.
I'm looking for a plugin or alternative to easily select the entire side of a rounded rectangle. IE - I click one point on a side, and it auto selects all four points on that side, or the like.
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Jul 15, 2013
I remember being able to select anything on the canvas with my Quick Select tool in CS5.5 Photoshop Extended. Recently, making the switch to CC, the Quick Select tool will show my slection as I drag along the canvas, but once I release the mouse, the selection seems to be reduced to the visible pixels. I was intentionally trying to fill the transparent sections with my effects as well.
Mind you, the magic wand will select transparent pixels just fine, but it also adds unintentional sections which is irritating. I should probably also pint out that I already looked into the "lock transparence" option in the layers, but I did not activate anything of the sort.
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Nov 21, 2005
if there are keyboard shortcut keys to these two operations?
1. Selecting a different layer than the active layer w/ keyboard key and selecting an item on that layer on the canvas?
2. Shortcut key strokes to select > Transform > Scale?
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Mar 25, 2011
Wondering if theres a plugin/feature for asto highlighting (sort of a preselect object) as in photoshop.
I have kinda got used to this in PS but am hoping theres a PDN equivalent?
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Apr 27, 2012
I have two questions for CS4, which may not be possible, and I didn't find in the feature forums.
1) Is there a way to do a color range selection created from all the colors that were selected from the magic wand tool. See attached image one.
2) Is there a way to crop an image based on histogram? For example if I wanted to remove all px that were above level 200 for all colors (or a specific color). Can effect the image at all from the histogram (without an side step to something like select color range)?
I'm working with very large images on multiple systems (both 32 and 64 bit, all CS4). Normally in the 50,000x30,000 -- 50,000x70,000 px range. For the sake of argument and ease of use I could scale down but eventually need to be operating in this range. The images are created by stitching a series of images taken under high magnification. I would like to find ways to quantify certain regions of interested based on color, but that do not have great color separation (see image 1). The hope would be take this information from several images and export the histogram information. As far as cropping the histogram is concerned: the scanning process used to create the stitched images produces a lot of near white color variation that so far I've been unable to select entirely (via color range select using clusters). I would say my best effort is only 85% of the "white" (see image 2) I want to drop out the white px for size reduction and noise reduction when it comes to histogram statistics.
Also I know this is pushing the limits of intention for PS, but we tried this on three other software packages-seemingly designed for these purposes--and failed.
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Oct 26, 2011
In Quick Select command function, I want to use more properties value to select one type text or other object.
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Oct 9, 2012
When I click the select tool, a brown selection type of rectangle appears in a particular area of the illustration, even though I have not clicked on the illustration yet. I assume it is some type of warning indication, but don't know what. P.S. It is draggable and scaleable - I can move it off the artboard. An example:
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Nov 21, 2012
I'd like to know the alternatives in 3ds Max to these popular tools:
1-When you have selected an edge loop, let's say, on a plane, how to select the polygons inside that loop? At the moment I'm using the split tool as a (very bad) workaround.
2-When you have selected some polygons, how to select the edges on the "boudndary"? (kinda the opposite of the above) At the moment I'm using the detach as element and border selection as a (very bad) workaround.
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Sep 5, 2013
I accidentally turned something on in Autocad, and I want it to go away, I have no idea what it's called or how to get it gone. It's akin to the "select other" window in Inventor when you select at the intersection of several objects.
How do I make this go away?
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May 15, 2008
Right now, when i click one object and then another, the first object becomes deselected. Holding shift is the only way for me to select multiple lines right now (other than dragging of course) but that's not what I'm used to and it annoys me a lot. At first everything is fine but then after a while it does this without me changing any options at all.
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