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Changing a train's colour.

Nov 13, 2013, 23:29
Post: #1
Changing a train's colour.
Hi there, I was wondering how to change a train's livery (colour) to another colour that I created with a template livery I made in an external program, leaving in things like windows and reflections in there, but in the new colour.

The problems generally happen with vehicles with multiple colours

As an example of what I mean, I'd like to change the colour of this http://farm5.staticflickr.com/4008/45435...f6c4_z.jpg into something like http://www.bahnstatistik.de/Bilder/Steue...f269bw.jpg.

I've been looking at various tutorials about how to do this, including many youtube videos, which detail how to change the colours of cars, but they mainly involve anther way including the colorize, which would do the entire vehicle based on HUE, which in this case, wouldn't work due to the multiple colours / shade the original vehicle has, including text.

Other methods use hard light to project various external images onto the body, but this mainly has a large amount of colour fluctuation with the new paint. This method generally gives the best impact when the entire image is white, doesn't say much when I am trying to preserve things like reflections and shading.

I generally do not have enough experience with GIMP to solve the problem out by myself and it would be nice to have some help and I think the problem is too specific for me to find.
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Nov 14, 2013, 18:01 (This post was last modified: Nov 14, 2013 18:04 by BenDragon1337.)
Post: #2
RE: Changing a train's colour.
The only problem with changing the hue wouldn't really be 'enough' to present the desired results which I am looking for.

I chose a pair of particularly difficult pictures to demonstrate the issues I am having, in the form of multiple colours, shades, reflections and text in the first image, and in the second image, I used an image which presents a different livery section with clearly distinct boundary lines, which required to have different pattens which are clearly visible with little to no reflections.

The idea was inspired by Fictitious liveries which I thought I could achieve the same effect to demonstrate how a custom livery that I chose and painted onto a vehicle of my choice.

I got close to the desired effect using a similar method to what you suggested, but adding anything specific (such as additional gradients and lines) over the solid colour really takes the cake and ruins the overall effect that I am trying to achieve by overlapping the various reflections and lighting effects.

This would be my attempt on one of their vehicles as a test to see how it turned out.

http://imageshack.com/a/img812/7585/dvt.png

It turned out good, but not as good as I has first hoped it would turn out (the various colours were almost spot on, it's just that during adding additional detail, I didn't preserve the effects that ruined the rest of the image, it was also my first and only attempt, because I couldn't get round that particular hurdle).

Which is why I wondered "how would the experts do it"?
Which is why I wanted to see how you would attempt a similar project in the first post.

Also, mentioning the first post, I believe I forgot another resource which could help achieving the right colours in the first place on the vehicle.

http://h-transport.pxtr.de/bss.htm

It would be nice to achieve a good, consistent result for once.
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Nov 14, 2013, 22:38 (This post was last modified: Nov 14, 2013 22:46 by BenDragon1337.)
Post: #3
RE: Changing a train's colour.
(Nov 14, 2013 21:55)ofnuts Wrote:  
(Nov 14, 2013 18:01)BenDragon1337 Wrote:  The only problem with changing the hue wouldn't really be 'enough' to present the desired results which I am looking for.

I chose a pair of particularly difficult pictures to demonstrate the issues I am having, in the form of multiple colours, shades, reflections and text in the first image, and in the second image, I used an image which presents a different livery section with clearly distinct boundary lines, which required to have different pattens which are clearly visible with little to no reflections.

The idea was inspired by Fictitious liveries which I thought I could achieve the same effect to demonstrate how a custom livery that I chose and painted onto a vehicle of my choice.

I got close to the desired effect using a similar method to what you suggested, but adding anything specific (such as additional gradients and lines) over the solid colour really takes the cake and ruins the overall effect that I am trying to achieve by overlapping the various reflections and lighting effects.

This would be my attempt on one of their vehicles as a test to see how it turned out.

http://imageshack.com/a/img812/7585/dvt.png

It turned out good, but not as good as I has first hoped it would turn out (the various colours were almost spot on, it's just that during adding additional detail, I didn't preserve the effects that ruined the rest of the image, it was also my first and only attempt, because I couldn't get round that particular hurdle).

Which is why I wondered "how would the experts do it"?
Which is why I wanted to see how you would attempt a similar project in the first post.

Also, mentioning the first post, I believe I forgot another resource which could help achieving the right colours in the first place on the vehicle.

http://h-transport.pxtr.de/bss.htm

It would be nice to achieve a good, consistent result for once.

There is no silver bullet. If you want to slap your own arbitrary colors/patterns on an existing object with its own arbitrary colors/patterns, you need a master's degree in Hyper-Realistic painting because Gimp (or PS, for that matter) cannot really tell if that clearer patch is part of the pattern or just a reflection

If you have an image that is plain gray, then you can apply your color in multiply mode and get something that will look about right(*). But it's likely that even subconsciously you have specific specular and diffuse reflection factor in mind that may not match the ones of the original object, and you will be left on your own to create the appropriate tones.

(*) Ideally, paint the real-life object with 50% gray, take a picture, apply color in Gimp in multiply mode, and divide by a uniform 50% gray.
Interesting concept... maybe I should:
  1. desaturate the image, leaving a grey plain for me to work on.
  2. Create a template of the 50% Gray I require.
  3. Adjust the brightness levels via the brightness/contrast levels to suit the template.
  4. rub out all impurities in the image (including lettering, livery shades), leaving a plain template with reflections.
  5. overlay the new image over the new grayscale image.
  6. Set the new image to multiply.
  7. Create a new template with the required shade of colour I require (the colour will be the dominant colour )
  8. Adjust the brightness of the overlay to get the livery to approximately the same shade of colour as the template.
And hopefully I will have my new vehicle.

I might not have a masters degree for hyper-realistic paintings, there's nothing from stopping me from trying.

You are right about GIMP not really supporting things like reflections (there's no way for GIMP to ever support anything like that because you generally need other objects to generate the refraction projection), I guess it would be just for the illusions more then anything, to see if I can create something that's a bit more believable then what I have achieved already.
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Nov 17, 2013, 12:26
Post: #4
RE: Changing a train's colour.
Thanks you, I've sorted out my problem.
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