GIMP :: Adjust Color Balance On Scanned Image
Feb 21, 2013
What is wrong with my GIMP? This behavior persists in every 2.6 and 2.8 build I've tried, in fact I'm pretty sure I first discovered it somewhere in 2.4 .
It's GTK bug #644032 - certain adjustments made to the Hue-Saturation tool (with overlap) may have problems handling the red/magenta wraparound properly. Which was supposed to be fixed eons ago (and with exception of this one specific usecase, it already WAS - see GTK #527085).
It originally happened while trying to adjust the color balance on a scanned image containing ambiguously red/magenta hues (yes I know we have an actual tool for Color Balance, but I've never been able to quite wrap my head around what adjustments yield which results). I have attached a sample file demonstrating expected vs. actual results with this usecase. My GIMP is clearly screwing the pooch on these adjustments ... but HOW, because even when I browse the online git repo the relevant source code looks like it should work perfectly (I've even mentally stepped through it and verified correct results, unlike my actual GIMP).
Try performing the same adjustments on your GIMP (note which build and version) - do you get the same results I do?
View 3 Replies
ADVERTISEMENT
Dec 14, 2012
Is there a way to adjust the colour balance on multiple layers at the same time?
View 2 Replies
View Related
Nov 23, 2012
I have a picture taken by a nasty camera : one side of the image is more luminous than the other. I need this image to be analyzed by another software that count cells, so it is very sensitive to color differences. I would like to normalize the light over the entire picture, so that the soft will effectively count cells. Is there a function in GIMP that allows to do that ?
View 1 Replies
View Related
Aug 19, 2012
I am trying to come up with a script for batch processing since i have 800 pictures that need editing.
(define (do-many dir) (let* ((files-list (car (cdr (file-glob dir 0)))) (do-one (lambda (f) (gimp-color-balance)))) (plug-in-color-enhance RUN-NONINTERACTIVE image drawable) (plug-in-unsharp-mask RUN-NONINTERACTIVE image drawable 5.0 0.5 0) (map do-one files-list)))
Now i tried this in the console but the script stops no matter what part i try to fix.
View 1 Replies
View Related
Dec 5, 2011
First, a slightly long winded explanation. Shooting the creative family Christmas card this year in a Mini-Cooper (original 60's one). Basically set my lighting up and then shot individual members in the car to post them together. The only snafu - my 20 month old son wasn't exactly cooperating, so the 'good' photograph I have of him is in the drivers seat, and I wanted to move him in between us.
There were a few difficulties here. First, the light changed between originally shooting my wife (windshield was clear), as skies were blue, and when I took the photo of myself nearly an hour later (cloudy skies cast a glare on the windshield. I had a black scrim set up to the side which worked, but wasn't able to knock it out all together. So i faded the clear windshield from my wife's side over to my side with the glare, but I feel that looks fairly natural (or at least good enough for the Christmas card).
The trick comes with my son - I cut him out from where he was at the drivers seat (had to do some shoddy work on his shirt where the steering wheel blocked him), and put him in between us. However, it looks like his coloring is off from what we are - and I can't quite seem to get it right. Color balance is definitely not my strong suit in PS.
View 8 Replies
View Related
Oct 6, 2011
I scanned a logo that was designed with a pen. I've cleaned up most of the 'spots' from the paper, being not pure white.
Now, I would like to change the color. It was black, how do I change it to red or blue? I can't flood fill as you would imagine, because not every pixel has the same brightness.
View 4 Replies
View Related
Dec 10, 2011
I would like to scan an image and clean it afterwards because areas of the same color in the original image (a poker card, so a simple logo with white, black, red, blue and yellow areas) end up to have spots of different color.
Is there a way to improve scan fidelity or edit the image with Gimp in order to smooth these differences and recreate the same areas of uniform color?
View 1 Replies
View Related
Dec 13, 2013
Using Gimp 2.8 in Windows 7. I have a scanned image of a topological map. At areas where the contour lines get too close, squares appear in between the image (See attached photo). Is there a good way to remove these extra squares in the contour lines rather than tracing the lines manually?
View 1 Replies
View Related
Dec 20, 2012
this scanned image from a book looks a little fuzzy... as all scanned images do... can you tell me how to clear this up??
View 3 Replies
View Related
Sep 24, 2013
Below is a logo that I scanned form a logo designs book. The grey area needs to be solid black.
I can use the trace feature on CorelDraw. However, the trace feature does not outline the artwork very well.
Is there some way I can make the logo below solid black and solid white without having to sketch the whole thing using features like trim and nodes?
It may be that the trim feature and the nodes feature is about the only way to make the artwork really good and sharp.
View 2 Replies
View Related
Sep 20, 2013
I am currently running Gimp 2.8 and am a new user. How to make an image's background white. I have a watercolor painting that I have scanned into my computer, however you can see some shadows from the grain and edges of the paper. I have tried some different ways to change the background completely to white, but I feel like maybe I'm missing out on a quicker method. So far, the one I've been working on is taking me longer than it took to even draw and paint the picture in the first place. That method was to use the fuzzy (lasso) tool, make a rough outline of my painting, use the quick mask button in the bottom left hand corner and follow up by using the pencil tool to make a more precise line around the image.
Another tutorial I found showed I should use the Select by color tool, select an area that should be white in my image and press Ctrl+x. However, when I pushed ctrl+x, I saw no change in my background and my image remained outlined in the shifting lines that the select by color tool causes.
Is there a way to achieve a plain white background with out going through the long process of tracing around the detailed image?
It should be noted that I'm not hugely familiar with Gimp as I've only used it a couple of times with tutorials. So, the more basic you can describe something, the better. I am also running Windows 7.
View 11 Replies
View Related
Mar 13, 2011
I love to draw, I would like to use my drawings on some iPhone game. I am wondering how I can process the drawings I scanned into a high definition image? I do my drawings in old fashion paper and pencil way, once The drawings were scanned, the resulting images look very rough, for example, the lines are showing the pencil marks, a straight line has a few bumps in the middle, and circles seem a bit off, is there a way in Gimp to do some fine tuning on the images?
View 2 Replies
View Related
Aug 28, 2011
how do I make an image look more clear... I have an image I want to put on Facebook, it isn't blurry or anything, but I want to make it look like the best image I have on Facebook, it's going on my profile pic, how do I adjust the clarity of an image to make it look super nice...
View 1 Replies
View Related
Aug 3, 2012
I'm still working on old family photos (it's a long-term project). This one is from my parents' wedding album, and it's an original black-and-white photo from 1952:
Maybe it's me, but I just don't like all those different gray tones, and I would love to get my mother's gown whiter (which it still is, BTW). I have tried a few things to even things out:
- Brightness/Contrast
- Threshold, Levels, Curves (I have to admit, I don't know what I'm doing with these; it's sort of hit-or-miss)
- Auto adjustments
- Fuzzy select to try to get the darker pieces more like the lighter ones, but the adjustments I just listed aren't doing what I want and are hard to see anyway; I thought the Bucket tool might work but I don't know how to use the gray area I want as a fill color.
View 3 Replies
View Related
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?
View 10 Replies
View Related
Nov 2, 2011
I know you are all going to say "it depends on the lighting" or "there are different skin tones", but I just need a simple starting formula, of which I can edit to work with the lighting. I just need a simple, generic caucasian skin color "Color Balance" formula, which can be applied to a monochromatic image.
View 3 Replies
View Related
Mar 24, 2013
I want to use a color balance layer with a vector mask to change the color of a shirt to come as close as possible to matching a particular color swatch. So, say the color swatch is RGB, 101, 164, 33
The color balance has the 3 sliders and I can adjust:
cyan -> red
magenta -> green
yellow -> blue
Is there a way of converting the RGB values (or CMYK values) from the swatch that is not trial and error that will tell me where to set the 3 color balance sliders to match the swatch color?
View 1 Replies
View Related
Jun 25, 2013
I made a ring and I want to change the color using color balance. It's with particular, multiple copies with fast blurs applied to them to give the glow and it's all pre-composed with the particle layer. Now all I want is to change the color as a whole but color balance doesn't seem to work when applied to the pre-composed layer. I even tried color balancing the particle layer itself, made an adjustment layer and applied color balance on that.
View 1 Replies
View Related
Nov 13, 2012
I'm attempting to tilt this image for use in a game im writing. I've been using Map Object and rotation (Y) but this then causes pixel color changes on the boundary with the background color. How would I tilt this picture without getting the problem?
View 4 Replies
View Related
Sep 19, 2013
Have a photo of inside of bus, seat covers etc. Color comes out bold, very little black, I can't find a balance, where I have a fairly normal, but lighter black halftone, with an overlay of color.. (Old copy of PS 6) I know, ancient, but it works.
View 1 Replies
View Related
Sep 1, 2005
i use a few tutorials and they say about colour balance, can i get that in elements?
if not is it possible to port it from another version of photoshop or is there a plug-in for it?
View 3 Replies
View Related
Mar 30, 2009
I was wondering if anyone was familiar with algorithm used to Color Balance.
I'm interested in automating a process which includes Desaturating and then Color Balancing.
I solved the Desaturation (take the highest number of R G B, divide by 2, apply to R G B values of pixle.)
I am curious to know how a pixle would be modified by say, +100 Blue in Lows/Mids/Highs
View 2 Replies
View Related
Jul 10, 2013
I would like to know how the white balance is calculated on GIMP.
View 3 Replies
View Related
Mar 28, 2011
I have some jpg files with a wrong white balance.Flash refused by taking the picture.How can i correct this in GIMP?
View 4 Replies
View Related
Feb 3, 2013
Suddenly when applying a color balance adjustment layer I'm unable to click on the shadows, midtones, and highlights. They are each grayed out and I'm only given the option to apply the setting overall. I'm thinking I must have made some kind of setting change somewhere for this to happen.
The images are RGB 8bit color mode.
View 1 Replies
View Related
May 24, 2012
I have a question about color balance. It seems it's the only one that the drag and drop doesn't work. It's my pc , or is the default?
I added 2 screenshots. i added a red arrow to let you see the mouse pointer in the first screenshot i can drag and drop (i'm not talking about the sliders) in the second screenshot , ONLY color balance (and it's very WEIRD ) i can not drag and drop.
I'm under w7 , tested under 64 and 32bit .don't know about mac.
View 4 Replies
View Related
Mar 9, 2012
Editing a video in LR4 you can capture a frame, adjust the color, and save a preset to apply to other videos. BUT the frame capture is a jpg so you can't specify a color temperature; you hve to use the slider(s) and cross your fingers. I have two consecutive videos, one shot with AWB and the other set to Shade. I need to adjust the AWB shot (very cool) to match the Shade shot (very warm). There are so many sliders, I can't even get close to matching them.
View 1 Replies
View Related
Dec 30, 2011
I work in crop research and have written a code to analyze an RGB image and determine if a pixel is senescence, crop, residue/soil, or shadow. However, this only works if the color is balanced in an image.
I do not know what the technical definition of balanced color is, but to me it relates to the RGB curves one can see in the curves mask. Over the last 5 years a colleague of mine has taken thousands of photos that I need to analyze with my system, unfortunately some have blue hues, some are overexposed, and some are just flat.
Is there any way to apply ratios or mathematical equations to the curves panel so that all images have a similar balance that will work with the code I wrote?
(below I included a few images to give you a feel for the variance)
View 1 Replies
View Related
Dec 3, 2011
I am trying to use Color Balance and the window doesn't work. The only part that shows is the "Enhance Color Balance" box, the words "purple" and "green" just above, and the preview arrow (which does nothing) and "preview on image". Preview on image is checked and it does show changes but I am unable to uncheck it. Nothing else shows. Nothing I have tried has worked, including restarting the computer.
View 6 Replies
View Related
Mar 14, 2013
I'm running Revit Architecture 2012. I did a render and it looks fine in the default {3D} View. I selected to save it to the project and when I go to the renderings view to recall it, the color balance is all shifted off way way to the blue end. I tried going back over to render dialog and adjusting the white point all the way up, and it had the expected effect in the {3D} View (shifting everything to overblown orange), but nothing changed at all in the renderings View when I tried to resave it after making the adjustment.
View 3 Replies
View Related
Feb 3, 2012
I find that if I have some video that has poor color, if I grab a still from it and bring it into GIMP, GIMP does a good job on correcting it.
Now, I'd like to know what color correction settings were applied by that filter so that I can go back to my video editing package and apply similar color corrections across the entire video clip, not just the still.
View 3 Replies
View Related
