GIMP :: How To Delete Random Pixels
Apr 7, 2013
I'm working on a very small scale, and need to find a way to make an image which consists of 4 colors, randomly spread around the 16x16 pixels.
I have not been abel to get the desired affect with any of the noise filters, so I was thinking I could make 4 layers, one with each color, delete the parts I don't want and just merge them down.
Now, with such a small scale, I could do the work by hand, but I have to repeat the process at least a dozen times, and I want it to look truly random.
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Aug 27, 2013
For no apparent reason I am opening images where there would be a blue background, and getting blocks or streaks of black pixels. Using CS 5. How do I prevent or correct?
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Sep 26, 2012
I have pictures that have different objects over a canvas like/un uniform back ground.
I need to remove that background without any part of the objects them self.
I mange to get most of the background out using the magic wand , but i'm left with many random single/groups of noise pixels left in the picture since they were not captured with the magic wand.
most of the time i can remove those using the eraser or use the selection tools with different shapes around the pixels and press delete.
but those methods take lots of time, specially around a complex objects and as i'm getting near to them, i need to make my selections/eraser radius smaller and smaller.
I have tried to use a plugin called "Reduce Noise" that i found , but it does not work.
faster way how to remove this noise pixels without any part of the objects?
a plugin that "scans" the image/selected area and remove all pixels that are surrounded by transparency in it?
p.s I can't always select only the object/s itself/them self and just move it/them to a new picture.
p.s.2 maybe a plugin that the user can choose up to what size, a group of pixels, should be removed ?
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Aug 24, 2012
When I am exporting a jpg from CorelDraw X6, I keep getting random columns of white pixels to the right of the graphic image. If I switch the matte color in the export dialogue to black, I get random amounts of black pixels. In X4, when I would export a jpg, the resulting file would be cropped right to the image edge, with no extra pixels. I'm getting anywhere from 1 to as many as 8 columns of extra pixels on the right hand side, which is problematic for utilizing the resulting files for page layout.
I achieve the same results when choosing "Export for Office" and "Export for Web".
I'm running a 64-bit install on a Win 7 64-bit box.
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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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Aug 25, 2013
I am trying to create a script to specify a percentage of the selected items you want to remove.Here is what I have so far.
I still need to work out on the alert prompt and the if statement, but for now, I have the feeling that the selection.length keep changing each time Illustrator delete an object, and I don't know how to make it stick.
var selection = app.activeDocument.selection;
//alert prompt dialog for a percentage of deletion
for (var i = 0; i < selection.length; i++) {
if (Math.random < 0.5) { //need to work out the percentage
alert("yes")
selection[i].remove();
}
}
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Jul 31, 2012
Open an image with some detail in the lower right area. Create a duplicate layer. Choose the crop tool. Make sure the option "Delete Cropped Pixels" in NOT checked.Grab the crop corner in the lower right of your image and move it diagonally inward somewhat. Confirm the crop.
Get the blur tool, make your brush size fairly large and brush the lower right of your image. Allow your brush to go beyond the border of your image.
Okay, when your image is noticeably blurred, switch to the move tool, grab your image and move it up and to the left exposing some of the area you cropped out.Ta-da! Isn't that pretty? It only happens with the blur tool. Try using the burn or dodge tool and this doesn't happen.
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May 7, 2013
I would like to delete all transparent pixels surrounding my irregularly (non-square) image. The TRIM function only trims to a square surrounding my image and not to the edge of the image itself. Is there a work around for this? I have looked around and haven't found one.
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Mar 25, 2009
I've made a rectangle but I don't know what tool to use to make a selection on a certain part with it. I tried the wand to edit>cut but that didn't work. Also I tried the eraser but that was too messy.
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Sep 19, 2013
When I use the crop tool, with "delete cropped pixels" selected, I expect that the image will be cropped destructively and that the cropped out portions will dissapear. But when I select one of the now cropped layers to drag it or free transform it, the cropped pixels are still there.
The entire original picture plane appears in free transform and in dragging the layer, the cropped out portions appear as if the image was never cropped. I recently upgraded from CS4 so this feature is completely new to me. Also, I use Windows8
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Apr 17, 2013
Is there something I can do to stop the appearance of random straight lines? They appear to randomly leap out from the tablet pen curser to the edge of the screen. Pressure sensitivity does seem to work--everything works perfectly with the exception of these bizzare lines!
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Jul 9, 2011
I'd like to create custom effects using paths. Is it possible to distort a (rectangle) area along a given path? Let's suppose for instance I have a gradient in a rectangle area and I drew an open path manually with a few nodes forming waves, loops; I'd like to have the rectangle area "follow" the path and be distorted accordingly. Mathematically that would suppose:the rectangle area would be stretched to fit the path length andthe rectangle area could be "bent" using its gravity centre as a reference point. That'd be useful for creating smoke effects for instance. Can Gimp 2.6 do this or is there a plugin?
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May 29, 2012
I have a diagram scanned in one pixel mode (b&w). I want to change the line color from black to blue.
I tried this:
In the toolbox I altered the foreground color to blue. In the 'Select' menu I used the 'By color' option. I made sure the settings in the toolbox for 'Select by color' were set at default, then I clicked on a black pixel in the image. The black lines in the image became outlined with a dotted line. I then used the 'Fill with FG color' option from the edit menu. The sample color to the left of the menu item was blue. The image briefly 'repainted'. I removed the selection using 'Select' 'None' but the image lines remain black.
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Nov 3, 2011
I rotated some pixels, but afterwards when I do something else, the pixels become unrotated. I tried saving the image, but that reverts the rotation, too. Why won't the pixels stay put?
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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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Aug 19, 2013
I created a new image with the dimensions 11x8.5 inches and now when I scale ANYTHING it uses inches and I want it pixels, I CANNOT figure out how to convert the units into pixels!! it is NOT under 'units' in the menu!
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Oct 8, 2013
I have a square selection that I'd like to map into a circle of equal size. I see apply lens and map object...sphere, but neither of these seem to do a proper job.
The algorithm I'm after would basically take the pixels of the square and map them onto their new locations within the circle so that each pixel moves inward toward the center until it reaches its appropriate location along the the line from the origin to its radius.
I'm about to the point to just code it in C++.
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Nov 29, 2011
I've tried adjusting levels, curves, color balance and the heal plug-in, but I can't remove the red blocky pixels in a series of pictures that look like the one below:
How I could fix up these pictures? Do I need to use a red-eye or noise removal method? I'm using GIMP 2.6.11 .
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Oct 22, 2012
Is there a way to get a brush exactly 2 pixels square? If i set the Radius to 0.7, i get a 3 pixel brush, if set to 0.6, i get a 1 pixel square brush. I mainly use GIMP to touch up scanned in forms and tables and most of the lines are 2 pixels which means twice as much work to correct a skewed line.
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Apr 17, 2013
the link to the pics [URL]
how do i get rid of white pixels in the background
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Jan 5, 2014
Here are some brushes at radii 0.1, 0.2, 0.3, 1, 10, and 50.I thought brush radius was measured in pixels, or would at least scale in a linear fashion, but this shows otherwise. Why the maximum brush radius is set to a (small) fraction of the full slider?
I just found the Size slider that's separate from brushes... Woops. Radius slider still confuses me, but it's not a problem anymore. I don't see a delete button around, either. :/
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Oct 25, 2012
I have an image with an transparent background. I want to change all pixels that are not the background to one color. How do I do this? I can't select the pixels, they as arbitrariliy distibuted. I've played with threshold, but that's not working either. I tried Image-->Mode -> Indexed and then Use black and white palette, but that doesn't work either. I thought i would convert all non-transparent values to black, but instead its picking some threshold and making some black and others transparent. Example file attached.
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Mar 14, 2012
I've just started playing around with GIMP. I've made two images containing a text to start with. For DPL2.tiff, the resolution (both X and Y) is 72 pixels/in, for DPL4.tiff it is 1 pixel/in.
My question is, shouldn't there be a noticeable difference in quality of the images?
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Sep 13, 2012
I had a .JPEG of a leaf photographed against a white background. When I went to turn that white background into a transparent alpha channel, it seemed to work okay....except for the fact that when I then went to select the new alpha channel via the Fuzzy Select Tool, it wasn't selecting all these newly transparent pixels.
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Jun 30, 2012
How can I control the color of transparent pixels?
I save my image in RGBA (Windows bitmap). The RGB value of the completely transparent areas always turn completely black, and I want to control the color myself.
It may seem pointless, as the color is transparent, but I am using the image elsewhere (for creating mipmaps) where there is interpolation between pixels. Interpolating between 0 and 1 in opacity gives 50%, but the RGB part of the interpolation will mix with black, giving a dark halo.
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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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Aug 12, 2011
Whenever I paste an image from the internet into Gimp, the image is shifted 3 pixels to the right, and those three pixel columns wrap around to the left side. At the bottom of those three now leftmost columns are a red, green, and blue pixel.
What the bottom left corner looks like:
This only started recently and I can't think of anything I changed recently to trigger it.
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Apr 29, 2011
I have a big wallpaper and i would like to set the firm logo in the left bodom corner with something like 40 pixel from the left border en 100 pixels from the bodom corner.
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Jan 1, 2013
I need to create an outline map for another application. The world is demarcated into areas, separated by black lines. The map must only have black & white pixels.
Some questions about using GIMP for this.
1. Is there a tool I can use to make every non-white pixel black?
2. Is there a tool I can use to eliminate isolated pixels of the wrong color (that is for me a black pixel with all neighbors white or vice versa)?
3. Is there a tool I can use to make the black lines thinner? It is desirable in my application to have the lines be only 1 pixel wide
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Nov 3, 2013
I rebuilt my line on white background from Rich2005 and Ofnuts. My latest version is darker, smoother higher res and wider (see attached).
The problem now are stray pixels, many of them unattached to the line itself. I spent a lot of time with an eraser, but still haven't gotten them all. THERE MUST BE A BETTER WAY!
I found this excellent link on the subject. [URL] RobA even has a script to do what I want. However, I don't think it is GIMP 2.8 compatible, as I can't seem to find it to run it.
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