GIMP :: Switch To Index Mode Changes Colours?
Jun 18, 2012
when saving images for the web i try save them as indexed png's to save space.
however, when switching to indexed mode GIMP will alter my colours if i choose to use a palette with less colours than i have in the image. This is the most noticable if for example i have an image with bacgkround #ffcc00 and a multicoloured icon in the middle. due to the icon the image probably has over 100 colours. if i then choose 64 colours not only will it affect the colours in the icon, but change the entire, large, unicoloured background area to maybe fec50a (just an example). is there anyway to force GIMP to only use colours already present in the image?
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Oct 28, 2011
I have been using indexed mode to save 8-bit png files for the web, just as one would through the Save For Web interface in photoshop. sometimes it works brilliantly, usually when very few colors. but sometimes it changes some of the most dominant colors in the image. for example, if i make an image with background in #f3f3f3, two antialiased type layers in different colors, flatten the image and switch to indexed mode the background will change to something like f3f201 or whatever depending on the colors of the type layers (even if i choose 256 colors...).
EDIT: ok those exact instructions didn't actually replicate the problem this time that i tried it, but nonetheless the problem exists. if no one recognises it i will save the file it occurs to next time so you can all replicate the problem.
EDIT 2: happened immediately. i have attached a png of the file, even if you set it to 256 colors, switching to indexed mode will change the white background to #fefffc. once again, one could go into the color map and change it back to pure white, but to be completely correct one needs to change every color in the shadows (and antialiasing) that fade into the white, which will also have been offset by the switch to indexed mode.
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Feb 7, 2014
I use gimp to make layered stencils for spray painting...I reduce it to a couple of colours, seperate the colours into different layers and then cut them out...
When I do im left with a ghost type image where the original layer was..
example: [URL]...
Is there any way of avoiding this?
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Jan 9, 2013
If there is a way to switch between the eye dropper/brush tool fast.
On Photoshop there the "alt" key but on my mac it really wastes a lot of time for blending colors .
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Jan 13, 2014
I have some files that were originally edited in LR3. They appear in my LR5 library, but with the old LR3 density tools (i.e. 'fill light' and 'highlght rescue'). How to I switch to the LR5 density mode (i.e. 'shadows' and 'highlights')?
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Jun 6, 2012
I switched to 43 bit mode in CS5 clicking the checkbox in the info. section. I want to switch back but the check box is no longer visible! Where did it go and how can I switch back?
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May 24, 2012
I'm trying to convert VHS to DVD. I have VS4Pro and a Hauppauge Collosus capture card and I get the error "unable to switch to cpature mode" when I'm in the capture tab and click capture video. VS4Pro recognizes the card but pops up the error "unable to switch to capture mode". In device manager, the drivers for the card appear to be installed/operating correctly.
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Aug 10, 2012
In Corel Draw x5 how do I switch do vector mode?
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Apr 5, 2013
VS starts in Edit Mode. After connecting the video camera by a iLink cable to PC and switching the camera to Play mode, clicking on tab "Capture" an error message appears: "Unable to switch to Capture Mode. Check if your video capture driver is working properly" Question: How do I do it? I am not a computer savvy person, just want to capture, edit and finally burn my videos taken with the camera.
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Feb 7, 2014
Today I encountered a weird problem with Lightroom. When I switch from Library to Develop to edit photos, immediately, the photo changes. I get strange blue highlights appearing in an area that is largely black, and red, where there is white.If I do a command Z (on a Mac), it just changes back to Library mode.
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Sep 19, 2012
When I'm working in guided or quick edit I'm fine but if I switch to full edit mode I lose the gray background and my workspace turns parent with my desktop showing through. I can still work on the photo but the workspace itself is changed.
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May 30, 2012
I used the Ellipse Select Tool to cut, then paste an area in an image. Now the move of this image component is done I need to 'switch off' the ellipse to paint outside it. I expected the 'Select' 'None' menu option to switch it off, but it doesn't.
What should I do?
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Feb 10, 2010
If I create a new image all works fine.
If I open an image that I have previously created (I'm working with .gif) and then select a colour on the pallet (it can be either FG or BG) and then try to place the colour on to the image - the colour is different to what I selected on the pallet.
I have the same issue with the 'bucket fill tool' or by selecting 'edit/fill with FG color' or by selecting 'edit/fill with BG color' or by placing a selected color text onto the image. I haven't tried using any other method.
I've tried deleting and reinstalling Gimp and I'm on Win XP PRO SP3.
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Jun 19, 2011
I noted that when opening same jpeg image with the Gimp or a different viewer I get different results:
Gimp is no the right , EOG or geeqie on the left, I note a different tone of blue..
Why?? I am using The latest Gimp in Fedora 15.
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Oct 24, 2012
I have myself a picture of my kitcar which I am looking to change the colour of however I want to preview a selection of colours using GIMP to see how they look on the car.
How to "overlay" different colours on the car? I am not sure how to go about selecting just the body of the car so that I can overlay different colours.
I would prefer to not have to hand paint each colour over the body of the car.
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Mar 19, 2012
How do I make text with 2 colours?
©gosonyushidae@SSF
Like something similar to this?
The way I know how to do it is by typing the first word in black lets say, then open a new text dialogue on another layer and type in the other word with a different colour.
Is there an easier way to do this since I'm afraid that my text won't be in line with each other?
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Jul 15, 2011
Best way to get the colours to be the same when I replace a face onto another face esp if you can lightly dust the colours in so the finished picture looks natural
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Nov 6, 2013
I'm currently working on a forum template (phpBB), and I want to invert the colours of the background. I did it easily for some pictures, but I can't invert one of them.
It's a simple gif, I don't know why I can't invert it. When I go to the menu 'colours'->'invert', the option is disabled, even if I tried with several tools selected.
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Aug 30, 2013
I have Gimp 2.8 and I am using Single-Window Mode. I have about 15 images open at the same time and I am doing repetitive tasks on each of them. I made keyboard shortcuts to do the tasks themselves but I still have to use my mouse to go up and click the next tab to start work on the next image. It would save time if there were a keyboard shortcut. I see that under the Windows menu I can use Alt+1 through Alt+0 to select any of the first 10 images, but I have 15 open.
I wanted to know if there is a keyboard shortcut to just switch to the next tab or the previous tab.
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Mar 19, 2013
for example:
Colours > Curves ..... nothing visible. The toolbar shows the Curves options (histogram; sample average).
This happens for all selections in the Colours menu; all the other menus are working fine.
I know finding the magic words to use in a search can be the ticket!
I uninstalled gimp removed the .gimp2 preferences and reinstalled--
Edited: well this is embarrassing The png I was trying to edit with Curves had Indexed Colour layers.
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Mar 7, 2012
I'm trying to change colours using the fill tool, but I only get different shades of grey, whatever colour I change it to. I've tested a couple of things and can't work out how to alter this... likewise, the defult patterns also come out in black, white and grey..
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Oct 14, 2013
Basically I want to merge two images. Both of them are grey originally so I change them to RGB mode and change the colours separately. I then go to copy and paste one image on top of the other and it automatically changes to whatever the colour is of the destination image.
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Sep 17, 2009
Whenever I open an image in Gimp, it's just a little off colour. Then when I save it as an image file (usually png), it's even more off colour than what's displayed in Gimp. For example, if the image starts out with a grey background of 808080 (RGB Hex Value, 16-bit), in Gimp it's 7F7F7F, and when I save as a png, it's 6E6E6E (honestly, how does that make sense under any circumstances?). I've tried every combination of settings under colour management, to no avail. Once, I managed to get Gimp to display the correct colour, but when I saved it as a gimp file, and re-opened it, it was wrong again.
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Aug 16, 2013
In my Autodesk Inventor 2012 product design suit there is nothing displayed when I Press
Tools menu
Appliction Options
Colours Tab
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Jun 17, 2012
i am planning to spend some weeks in France - and there i want to take many many pictues.
The question - shoulkd i switch off the color chanel before i take the fotographs or afterwards. I can swith it off at the Nikon Camera - sure thing
Black and White - when to switch off the color chanel
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Jul 23, 2013
For a long time I'd been using Gimp 2.8.0 on my Mac Mini. (Running Lion) It worked well, but it had a few annoying Wacom-related bugs.
Today I upgraded to Gimp 2.8.6 ... and it's very very slow. I tried 2.8.4. Also slow. (On the plus-side, the Wacom bugs are totally gone.)
I tried a couple of different binary builds. The two linked from the Gimp homepage and one from Partha.com. All very slow. At print resolutions, even something as simple as changing a layer visibility (Previously almost instant) now takes the better part of a minute.
Did something horrible happen to the rendering code during the X11 migration?
I've tried
--Turning off all color management.
--Working on monochrome files. (No improvement, which makes me think it must be draw-related.)
-- Increasing and decreasing the tile-cache size.
--Cursing.
So far I've just been using pre-made binaries, but I'm not adverse to compiling my own if I absolutely have to.
Rolling back to 2.8.0 fixes the performance problem, but I'd really like to have the bug fixes.
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Nov 7, 2013
For instance, when I go to paintbrush tool.
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May 19, 2012
If I'm editing an image and I click the toolbox (or, say, the docked layers dialogue), if I hover my cursor back over the image and press and hold spacebar so I can scroll around the image, currently I have to click within the image window before it registers my keystroke.
The more intuitive behavior and what I want to be able to do is just hover my mouse cursor over a window and and keystrokes or scrolling I perform happen within that window. This currently happens if I scroll using my mouse scroll wheel, but not with keystrokes.
I'm using single window mode in Gimp 2.8, though I've also experienced this issue in non-single window mode when using Gimp 2.6.
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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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Jul 4, 2012
I've been using GIMP for a while for basic website stuff. Very basic website stuff. I've recently been asked if GIMP has some more advanced features. Well, advanced put to my usual level of use anyway.
So, I thought I'd query if I could do the following in GIMP...
(1) Edit a BMP but ensure the file size remains the same?
The person asking is using the images for a specific purpose and they always have to be the same size.
(2) Open .pspimages and possibly save back as this format.
The answer to this seems to be no on the opening front anyway.
(3) Restrict the image to a very limited range of colours, say 3-6?
Again this is due to the very specific and restricted nature of the images they are creating.
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Nov 23, 2013
I am trying to make Apple's mostly greenish star space wallpaper for iPhones from iOS 7 (see the attachment #1) into beautiful gradient of colours.
The problem is that I do not know how to do it, so was only able to make a striped version colouring via huge brush, not true gradient.
how I could make a really smooth, gradiental transition between colours?
Attached File(s) Original greenish star wallpaper for iPhone.gif (256.91K)
Number of downloads: 6 iPhone45WallpaperStars.jpg (160.65K)
Number of downloads: 4
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