GIMP :: JPEG Image - Specific Color To Transparent
Dec 26, 2011
I have a jpeg image of a motorcycle on a pure yellow background. I want to make the yellow transparent. Naturally there are a lot of spaces within the motorcycle image that contain yellow.
I followed instructions I found...
Removing the background of an image
1) add an alpha channel to your layer
2) use colors/color to alpha and use the background color
This results in the checkerboard being applied to the motorcycle, not the yellow background. I assume that's okay.
This makes all the pixels with the background color transparent, and those with a close color partially transparent.
Then:
- select the background with the magic wand,
- grow the selection by a couple of pixels to ensure that the border of the sprite is in the selection (the most important work of color-to-alpha is on the border pixels, so they shouldn't be protected)
This selects only the area outside the bicycle, but I don't mind reselecting smaller areas, if I can.
- grow the selection by a couple of pixels to ensure that the border is in the selection (the most important work of color-to-alpha is on the border pixels, so they shouldn't be protected)
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Apr 5, 2012
I want to select a specific color from within the image, and change all similar colors within that image to a different color. In other words, after using the Color Picker Tool to select a color from the image, I want to take the selected color (and everything in the image that is equal to or similar in color), and change them all to a different color.
I tried using the Path's Tool to create an outline in the image, and changing colors that way, but it changes all the other colors in the selection I don't want to change. I just want to change all colors in the image/selection that are equal to or similar to the selected color. How do I do this?
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Apr 7, 2012
How can I find all pixels in an image with an exact, specific color? So far, I've only managed to find the pixels matching a pixel I click on; but I wish to find pixels matching a specific color value!
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Nov 19, 2012
I have been working on colorization, by putting a transparent B&W image over the color background, all is good apart from when I do people and just want to show their eyes in color. Allot of the times eye color comes out wrong, for instance, when I did my daughter her eyes are blue but color came out brown eyes.
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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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Jan 6, 2012
I am working on creating a banner for a website and I am looking to use a couple colors from which is included on a jpeg that is provided for me, its been forever since ive tried creating anything and i wonder is there some way i can take the colors from the jpeg to use in my own color palette .
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Jun 17, 2011
is it possible to make a specific color transparent on a gif or png?
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Sep 23, 2011
I have been trying to make a forum signature, and I am using an effect that as a "side effect" makes the background black.
Is it is possible to turn the black background into transparency using a PDN feature or a plugin?
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Sep 22, 2012
I have a layer that is all white with text and some shapes (with heavy anti-aliasing, so the alpha channel variations of white, too) and I am trying to convert it to a specific other color (just a cream color that I have the HTML code for).
So, when a layer is all one color (not counting variation in alpha values), is there a technique to change that to a specific other color, rather than just toggling the "Color Balance" to get an approximation?
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Aug 12, 2007
I have Photoshop CS2, and I'm looking to make a jpg/jpeg image to texture a VRML model with - The graphic needs to be semi-transparent, as I need the nurb's Material color to show through it. I appreciate that a png image would offer a solution to this problem instantly, but this format is not usable in the situation offered... On the same note, gif format is also out of the equation because it offers only transparency, or no transparency.
If you look at this image ChromeBall.jpg it is exactly what I'm looking to achieve (but not with this image). When I add levels of opacity to the jpg image I want to be semi-transparent, the background of the image shows up as being 'white' whether I save as, or save for web.
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Jun 4, 2011
Is there a way to make the color select tool not only select a specific color but related shades as well. I have a graphic that is mainly shades of gray but with black outlines and divisions as well as other colors mixed in. I want to shift all the shades of gray to shades of dark yellow without have to select each shade individually.
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Jul 24, 2011
I'm currently trying to use the text tool so I can color a line of text in two differing colors. However when I highlight the characters I want to change the whole line changes.
How do I change the color of specific characters in a line of text?
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Jul 15, 2013
How to change the shape of an image to fit a specific shape.
What I'm trying to do is reshape a geometrically patterned rectangular image so that the printed image fits around a truncated cone. I'm trying to use the image to create a stencil for glazing a straight sided pottery cup. I know the circumference of the rim and the circumference of the base of the truncated cone so I need to wind up with the borders of the image having a convex curve at the top with the arc length equal to the rim's circumference, a concave curve at the bottom with the arc length equal to the circumference of the base, and with the end points of both arcs connected with diagonal lines equal to the length of the sides of the cup. In addition, I'd like to preserve the image in it's entirety, but distort it as necessary to fit the borders without cutting any of it out. (I attached a sketch in case my pattern shape description was confusing).
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Dec 13, 2013
I'm creating a sprite sheet and I need to move my sprites to a specific location.
For example my sprite is 120x120, so I need to place the 5th animated frame at EXACTLY 120x5=600 pixels from zero or at 600, 0. I can't seem to find a way of doing this in GIMP, it shows me a mouse delta position from where I first clicked?
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Aug 18, 2011
So I am making digital color prints at 24x30. the photography work is about color fields and gradients, so I need super high res files. I have set the size to 24000x30000 pix at 1000 dpi..now my problem, when i go to save the gimp file as a jpeg i get this error message "JPEG image plug-in could not save image"
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Apr 4, 2012
I have a PNG image with only one layer as a start point. It has a faded map on it.
I have a second PNG image with a hex grid on it. I do colour to Alpha to establish transparency on the hex grid for white filled hexes (others are not filled with white).
Now, I wish to overlay a portion of the first image with the faded map with the non-transparent part of the second image.
So I select by colour (for the hexes not filled with white) on the second image (the overlay) and I then paste to the first image (after creating a transparency layer and selecting it to receive the overlay).
I see the desired overlay section (minus any transparent stuff as expected), however it is centered over the map in the first image, not where I want it to be. It is a floating selection and must be anchored. So I select the anchor icon in the layer dialog and I think I anchor it into the transparency layer on the first image (that's what I'm trying to do anyway).
And then my problem:
I want to move the thing I just pasted in to the right place with respect to the underlying faded map. I attempt to use the move tool, but all I move is the background map (pretty much the opposite of what I want).
Nothing I do seems to let me reselect the pasted-in overlay so that I can move it.
Why I can't ever reposition the pasted in overlay? It should be in the transparency layer I created but even if I select all, I don't seem to be able to move anything other than the background image.
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Jan 2, 2012
I have an image that I want to paste a question mark over. I found this clipart question mark. I would like to fill in the regions of the symbol with grey translucent color.
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Mar 12, 2012
When you reduce the image quality of a jpeg image , How exactly is it reducing the quality? is it applying file compression , reducing bit depth or is it reducing the sampling rate of the image? or anything close to the above....
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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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Dec 16, 2012
I'm using -color-matrix on a bunch of images to change colour temperature slightly:
convert -quality 94 -color-matrix "1.0 0 0 0 0.975 0 0 0 0.95" x.jpg y.jpg
Problem is, in sky areas, this causes patchy colours and banding issues. However, and this is the strange part, if I convert to TIFF (even using JPEG compression), and then apply the colour matrix, I don't get these issues.
BUT, even wierder, if I then try to convert the fine-looking TIFF image to JPEG again (even with -quality 100), I get these patchy colours again.
This is with GIMP 2.6.12 on a Fedora Linux system.
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Mar 16, 2013
How to change the color of an icon (ex: from black to grey). My problem is that the end result is sometimes an icon that is partially transparent.
Here is what I am doing:
1) I open the image of which I want to change the color (black icon over transparent background)
2) Create a new layer and color this in white.
3) Merge the two layers
4) Create a new layer and color this with the color I want for my icon
5) Go to Colors -> Color to Alpha
6) Select the current color of the icon
7) Click Ok - Now icon color is the wanted color over a white background
8) Create a new layer and leave this transparent
9) Go to Colors -> Color to Alpha
10) Select the white color (current background color).
11) Click Ok - Now icon background is transparent, but icon color is also partially transparent.
Is there a way how I can change the color of an icon without getting the icon color transparent.
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Jun 26, 2011
as you can see I was able to make the background transparent by 'select by color' + 'add alpha channel' + 'remove selected area' but I also need to remove the white behind the 50% opaque reddish orange flames as well, i cannot select the white by 'select by color' or 'magic wand select' or any of the selection tools because of the issues of the white / reddish orange mix of opacity, so I need removing this white behind the part opacity color.
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Sep 26, 2012
What I want to know is if there is a way to make a hotkey or at all save specific options for specific tools. Let's say I'm using the 'Paintbrush, Opacity 70%, Hardness 075, Size 4.00' as my "standard outline tool". Can I some how save that preference (and any other tool such as "Specific Eraser Op. 100%, Hard. 100, Size 10.00) so that I can easily switch between "Ouline Brush" and "Specific Eraser" . Maybe to the 'f-buttons'
I'd like to be able to make maybe 5 specific tools:-Outline Brush
-Small Eraser
-Big Eraser
-Detailed Color brush
-Big Color Brush.
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Apr 11, 2012
I've searched for hours for directions on how I can use my 3D template in GIMP. I purchased the template from a stock photo site. It already does have a 3D appearance with proper shadowing etc. I am creating a 3D book cover. So I only want to fit the jpg image I created,. the flat 2-D one, to my blank 3-D book cover template. I also want to add text to the spine of the book, or an image of this text if that's how it's done.
This would be the same process I think with any sort of 3D template and 2D image. For example, some people create boxes and other items in 3D. But I don't need to know how to create the 3D effect. I already have that in the template I purchased. I just need to know how to add my jpeg image to the template so that it fits properly.
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May 17, 2013
I wanted to create transparent icon.i created it and i can see black&ash rectangles around the image, this confirm that as a transparent image.But after exporting it to jpg or png White color background is coming when i see it in photo viewer.
How to avoid that white background, am i doing a correct method?
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Jan 27, 2013
I want to save it to a JPEG so I can view it in my pictures.Is there a way to do this. I do not have a choice when I save as.
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Jun 13, 2013
I've been a GIMP user for a couple of years and have just encountered a new and unexpected problem with version 2.8.4. I'm attempting to export a file to JPEG format, and am receiving the message:
"Saving 'FILENAME' failed: JPEG image plug-in could not save image."
I ensured I had adequate disk space, tried saving to different locations (including other drives on our network), tried resizing the image, and nothing will work. The message just recurs each time, no matter what I try.
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Dec 27, 2012
exported transparent png fiiles get this rainbow of color distorted bleed when previewing or importing into programs that cannot read the png's transparency!!! even program that can read the png's transparency after you check a 'make transparent' checkbox (such as Memorex Expressit label design studio) have this distorted color bleed!! like in the label program checking 'make transparent' leaves the rainbow color distortion in!!!
this seems to be ONLY happening with Gimp exported PNGs!!! other PNGs and other programs that can generate transparent PNGs don't have this issue!
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Nov 16, 2008
I made a simple panel in photoshop and used the #number for the color selected to fill one side of the panel in my CSS code. When the page is rendered there's a very slight difference between the panel and the background which I expect to be exactly the same.
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Jun 7, 2013
I was wondering if there was a fairly simple and straightforward way to make an image's background transparent (for example, a transparent .gif) without using layers. Similar to some apps that have an eyedropper tool used to create transparencies.
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Jan 21, 2014
What im trying to do is edit a tga file..... this is the file im trying to edit [URL] .......
The image its a tga file that its transparent and after i edit it for example i change the colors of the stuff on image, and save it it becomes dark or other colors it loses its transparency how can i keep it as it is with transparency after editing and keep it as tga....
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