GIMP :: Color-matrix Causes Patchy Colours But Only With JPEG
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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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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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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Dec 14, 2012
I am using the COM SDK.
Most of the objects have a Matrix which is going to store the objects rotations, flips, etc.
Many objects that I see appear to have a translation that takes it to somewhere around 7,000 - 9,000, but it's not constant.
What is this matrix in relation to?
From what point is it translated from?
When I set the matrix to the "identity" matrix, all the items are flipped upside down. Why?
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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 21, 2005
material regarding natural color matrix technology?
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May 7, 2012
The brush dynamics matrix is all greyed out and there is no way to activate it. Maybe Im doing something wrong. I understand that you can either set the brush dynamics preset or set the matrix. Also the curve editor doesnt seem to be working either.
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Oct 4, 2011
importing photos into Xara 7 - the photos have a "green" sheen to them - I've only noticed as I've been using xara to print out some photos for a friend who's printer died. he uses powerpoint to print his and the difference between the two is really marked! i'm assuming it's due to CMYK/RGB differences (ppt is RGB) but I can't for the life me see where I can alter the Xara settings so the photos come in as per ppt.
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May 8, 2011
When I publish from X4 to jpeg, the (RGB or CMYK) colours appear much darker than they ought to. Is there a solution to this or could it be false settings, If yes, what settings.
[URL]....
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Jun 12, 2013
I've been using CS6 for 1 year, and suddenly have some desaturated skin tones in a few photos, it looks like the skin is painted with grey paint! I first saw this in a couple of JPG conversions, the RAW NEFs from a Nikon D800 were ok, but now have found the same thing in some NEFs. I am using an HP laptop with Win 7 64 bit and 8gig memory.
If I advance the Sat and Vib sliders in ACR, some of the grey becomes colored, suggesting there is a threshold below which the skin tone saturation drops out completely. No other colors exhibit this effect!
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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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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 15, 2007
If I have to colours, and I want to add a third colour between them to make it flow more... is there a way to determine the middel colour between 2 colours.. eg. grey for black and white
Or between light red and dark red.. there is "normal" red.. but how do you determine the value of normal? Or do you do this just by eye?
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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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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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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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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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Aug 7, 2013
I need to install the Pantone Colour Book plugin which has the new Pantone Color Bridge Colours. Where do I get it from, and how do I install it?
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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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Nov 18, 2012
I am trying to remove some unwanted buildings and replace them with sky. I created a mask, removed the offending buildings, used the clone tool and recreated the sky in its place. All looked great in Gimp. When I export to jpeg, I see the outline of the mask I used and what appears to be areas that were not completely filled with sky using the clone tool.
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Jun 17, 2012
I have Gimp2.8 in windows. Under 'save as' it shows only xcf and 3 other related formats but not jpeg etc.
My friends using 2.6 in ubuntu have all the formats to save as. Is it that in windows you cannot save to any other format.
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Jul 25, 2011
Is there a way to export a JPEG at a certain DPI?
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May 9, 2012
I have used gimp for a few years, today i installed windows 7. i was excited to try gimp on win7 but unfortunately its the new version of gimp that i hate . anyway, when i try to save an image there are only a few formats available: xcf and other GIMP formats i guess. there is no gimp brush format or bmap or jpeg or anything! I am making a timelapse for youtube.
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Oct 26, 2012
I get an error message when trying to open a file that I previously saved(exported) from gimp. It says,
"Plug-in crashed: "file-jpeg.exe"
(C:Program FilesGIMP 2libgimp2.0plug-insfile-jpeg.exe)
The dying plug-in may have messed up GIMP's internal state. You may want to save your images and restart GIMP to be on the safe side."I can open other jpeg's just not this certain one.
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Apr 8, 2006
i'm working on a job with 2 colours. I already did this using CMYK and setting 2 of them to 100% and the other 2 at 0%. But people who press these posters say me that they always have to convert the CMYK file to a 2 colours file. Is there a way to set my colours to 2 colours instead of 4?
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