GIMP :: Setting To Cause GEGL To Use Alpha Values Of 0 For The Pixels
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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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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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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Jul 19, 2011
Whenever I try to use the 'Colour to Alpha' tool, while it works on most of the image, I always get little white dots left behind, and have to spend ages use the eraser tool to get rid of them.
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Dec 4, 2013
I have a plain rectangle with overall c09300c0 RGBA levels.I want to change the alpha channel value from c0 (193) to some other value, for the whole image at once. Or some other color channel.
How can I change the absolute value of a channel ? The color menu has only relative adjustments.
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Mar 8, 2013
I know how to add alpha channel to each layer individually and manually but is there a way to have an alpha channel added to each new layer automatically?
I'm using 2.8.2
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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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Sep 20, 2012
When I select "Tools - GEGL Operations..." a window with an empty drop-down list appears, i. e. there are no functions in the list (can't drop down anything). So it seems GEGL functions are not available in my GIMP.
(Windows 7, 64bit, GIMP 2.8.2)
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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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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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Dec 12, 2011
I've been having a hard time googling this question as it's hard to put in bite-size words. I'm looking for an easy way to take the alpha levels of each pixel on one layer, and then combine that with the color levels of each pixel on another layer. Let me give you an example. I want to take the alpha levels of image 1, replace the colors with the colors of image 2, and be left with image 3 (Only no background, because the alpha level should be zero!)
[URL]
I achieved the effect you see in image 3 by using the "difference" blending, and then inverting the image. Problem is, I've still got the gradient as a background which doesn't really work because that icon needs to sit on anything.
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May 27, 2008
I have a PNG image and like to edit the alpha mask. As there's no separate alpha layer inside the PNG image, but all pixels have a certain alpha value, I'd like to extract that with Photoshop. How can I do that?
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May 21, 2013
I would like to display actual document sizes (real inches as in 5" X 7") in the print module in Lightroom. I can calibrate pixels per inch for my monitor in Photoshop but can't figure out how to do it in Lightroom - i.e. on my 24" monitor 94 pixels per inch will display my print size document in it's real size on my screen.
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Apr 5, 2013
I have a problem setting sysvar like SNAPBASE, which requires 2d point or 3d point. I always get wrong input for the following lines.
double[] point = new double[2] {5,5};
object value1 = point;
Application.SetSystemVariable("SNAPBASE", value1);
what value should I give a 2d point or 3d point?
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Jun 16, 2011
how (if) I can set up my dynamic blocks so that I can set the parameter values as I insert the block, rather than with the grips afterwards?
To take a simple example; I have a block consisting of a rectangle, with 2 linear stretch parameters - length, width. Can I set it up so that when I insert the block, it asks for the length and breadth,just as it would for attributes.
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Nov 20, 2013
I have a Multi-Value Parameter "MV" that I want to populate using a Named Range from an Excel file that is already populating other parameters for the same file.
I currently have the file working by populating "MV" by using the snippet from iLogic below...
MultiValue.List("MV") = GoExcel.CellValues("filename.xls", "Sheet1", "A2", "A10")
The reason I don't like this method is because if ever that range changes... all the iLogic code will have to be updated as well. How to set a Multi-Value Parameter using a Named Range from an Excel file? I assumed the below snippet would work but I am receiving
"Array was not a one-dimensional array." as an error.
MultiValue.List("MV")=GoExcel.NamedRangeValue("Named_Range_Value")
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Nov 20, 2013
in iParts factory I would like to create part ## by setting common name and adding to it different values drawn from part parameters.
Please refer to attached image – common name in that example would be “DRILL” and description of the diameter and length automatically taken from parameters in columns “DRILL_D” & “INSERT_L”.
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Aug 12, 2013
I have a 24bit PNG image to be used as a texture in my little game. I want to blend this texture with other colors which require it to have an extra alpha channel. I did some search online and tried some methods including add another layer and add transparency to the image, but neither worked(after I exported the image to png and reopened it, it still only contains 24 bits for every pixel).
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Jul 17, 2013
I'm using 2.6. How do I add an Alpha Channel?
I can't find it in the selections.
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Jul 4, 2013
When I color a the background of a photo to alpha it works just fine, I save it and export.
But when I try to open that same photo anywhere else the background is white .
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Apr 19, 2011
How to do the steps described in the article "How do I Import Alpha Textures?" (
[URL].... butwith GIMP?
Is special, how can I create an explicit alpha channel that I can manipulate?
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Dec 7, 2011
making a alpha channel transparency; Funny thing is. I made it work once a few days ago. I went to bed and forgot to write down how i did it (Tried everything, almost)
In the link right here [URL] n i have 4 files; Q3a_arrow_gimp_ver4.tga (TGA that works as i want it, you'll notice ALL the alpha channels have a black layer channel in the channels tab, how do i recreate that?) Q3a_arrow_methodtry.tga (tried to recreate with THIS tutorial [URL] with no success P.S. i tried loooads of tutorials but this recreation seems rather close to the working .TGA i need) Q3a_arrow.ai (sourcematerial all vector from Adobe Illustrator) Q3a_arrow.png (picture with transparency intact if needed for comparison)
So; Now... What i did to make the working picture was making a .PNG - drag it into gimp.. I recall doing some Alpha and or masking or selection thing with it, then rendered it for .TGA since Illustrator does not support the kind of .TGA i needed. Worked flawlessly in the engine where i use a function called alphafunc GE128 (blend with black as invisible layer and white as solid)
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Jul 12, 2013
Is there an easy way in GIMP to invert the alpha channel of an image? Transparent should be opaque, opaque should be transparent, almost transparent should be almost opaque, etc.
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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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Oct 14, 2013
How do I set the spacing to make this brush draw seamlessly?
Attached File(s) brush_spacing.jpg (25.86K)
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Nov 2, 2013
Some .BMP files.
I need to save some images with transparency that are in .BMP format, but said images seem to have what's called an alpha channel, which covers all of the image's background and not the transparency that I need. I've tried to use the "Convert color to alpha" option, but it appears that that only works in the image that I want and not in the alpha channel itself (yeah, I didn´t know what alpha channel was until then).
I leave an example of one of the various .BMP files that I want converted to .PNG with transparency.
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Nov 9, 2011
I'm trying to create an image which emulates a solar corona (it's basically just a blurry circle). It's as easy as making one brush stroke in gimp, but my problem is that i can't get all the channels to be correctly set.
Ultimately i just want to edit the alpha channel, NOT the RGB ones. They should all be pure white, or 255, 255, 255. But for some reason, no matter how much masking or color selection or clicking only the alpha channel and not the RGB ones or anything that i do, i cannot keep the RGB white while editing the alpha channel, every stroke that affects alpha seems to invariably affect the other three.
How can i edit ONLY the alpha channel?
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Sep 4, 2012
I want to use the Threshold Alpha command on a Layer of Solid Noise, but nothing happens. If I set the threshold to 255 everything goes transparent, anything below that the clouds are supremely unimpressed. It's an RGB image, has an alpha channel, no Alpha channel lock, the Threshold tool works fine. I also tried creating another test picture with several gradient in greys and colors, and they are equally unaffected by Threshold Alpha.
I'm using GIMP 2.6.11 on WinXP SP3.
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Aug 5, 2013
My task is to do a batch processing over an folder with images. I want to add an alpha layer to every image (png). The alpha layer is from a static second image (bmp).
I can accomplish the task in the GIMP front end manually, but the exactly same steps in my script aren't working.
Here's the script:
(define (script-fu-batch-alpha-add globalpha globpics) (let* ((filelist (cadr (file-glob globpics 1))) (filealpha (car(cadr (file-glob globalpha 1)))) (imgalpha (car (gimp-file-load RUN-NONINTERACTIVE
filealpha filealpha))) (drawablealpha (car (gimp-image-get-active-layer imgalpha)))
[code].......
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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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Sep 27, 2012
Is there anything that can be done using an alpha channel, that can'tbe done using masks and layers, or vice versa? Context of question: I've worked extensively with masks and layers.I've never worked with alpha channels.For example:
Using an alpha channel:
1. Open two single layer images, A and B, neither one of which has analpha channel.
2. Drag the image B over to A and close B.3. Now image A has two layers, A and B. Put layer A on top, selectlayer A, set the blend mode to Normal, and add an alpha channel.4. Erase part of layer A, where-ever you want layer B to show through.At this point, layer A has an alpha channel with white where you wantlayer A to show, and black where you want layer B to show, but it doesnot have a mask.
OR
Using a layer mask:
1. Open two single layer images, A and B, neither one of which has analpha channel.
2. Drag image B over to A and close B.3. Now image A has two layers, A and B. Put layer A on top, selectlayer A, and set the blend mode to Normal (don't add an alphachannel).
4. Create a solid white mask for layer A. Paint black on the maskwhere you want layer B to show through.At this point, layer A has a mask with white where you want layer A toshow, and black where you want layer B to show., but it does not havean alpha channel.
In both cases, using a mask or using an alpha channel, the net resultis the same.So again, is there anything that can be done using an alpha channel,that can't be done using masks and layers, or vice versa?
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