Render with V-Ray and change colors in Photoshop - Tutorial | Cg Blog

Change colors without render again.

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How many times did you encountered a terrible customer who suddenly ask you for deep color changes on your render?

How to quickly get results, if your render is already done?

Direct color correction in photoshop is great but not every time, this is time to use masks. With the photoshop masks you can make strong operations on the image, you just need a few minutes to create the perfect mask for your needs. Here’s how I usually do.

A fast way is the dear old Scanline. With Black and White materials I get that one:

Then in Photoshop complete the process. Watch the video for all details:

RESUME – In 3ds Max:

  • Panel render (F10)> Common> Assign Renderer> Default Scanline Render
  • create two standard materials: pure white and pure black:
  • Make white what I want to change – Black the others.
  • Turn off all the lights in the scene (don’t forget!)
  • Hit render

RESUME - In Photoshop:

  1. Open render-base.jpg and render-mask.jpg
  2. In “render-base” Duplicate the layer
  3. Create a new mask
  4. Apply image > “render-mask”
  5. Make any changes you want
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39 Responses

  1. poq2009 says:

    Your method is coorect but whoah, the way you generate your mask is a little fastidious. There is a script, RENDERMASK that does the job for you, try :

    • Ciro Sannino - Auth says:

      Hi POQ2009,
      yes I know this script, but I always prefer to explain a “method” if I can, I try to write an educational blog.

      The script you are suggesting works fine (I already use it and I will suggest it next) , but my goal is to describe an idea you can also apply to any version, any software because it’s an universal concept.

  2. Flooi says:

    Woah! I didn’t know you can do that.Thank you so much, this will come in handy often!

  3. Samitha says:

    You are a god… I always love your work. We are lucky to have a person like you even we are very far away.

    Thank you a lot.

    Works much better. Just a renderer Elements should include
    So you can change the color of any object in the scene, not just one.

    • Ciro Sannino - Auth says:

      Hi Vasily!
      How are you? 🙂 Thank you for your contribute..

      Don’t forget my blog is for explain concepts, so i HAVE to do “by hands” 😉
      Plugins don’t allow to think.. and that post works perfectly for my “educational” blog.

      Anyway Thank you for your link, I will surely test it. 😉

  5. Sir Rikimaru says:

    I think this a way which doesn’t involve scripts and lets you really understand the better techniques than relying on automated process. For me, its an eye opener to know some ways, methods and techniques which are manual but it let’s you understand the process itself fully.
    I loved to use fast and automated scripts but sometimes it’s also fond learning the process involve on achieving such effects. Thanks for sharing Ciro-San!!!!

  6. kurshed says:

    its very helpful..thnks

  7. kurshed says:

    Is there any way to change paint to texture paint

    • Ciro Sannino - Auth says:

      Hi Kurshed,
      yes… something is possible. I hope to show some tip in the next posts 🙂

  8. Wulfy says:

    Excellent travail.

    Voilà une méthode simple et facile à mettre en place pour réaliser des changements directement de couleurs dans Photoshop.

    Et non, ce n’est pas fastidieux à réaliser.

  9. Asim says:

    Thanks a lot for this help….. Good Luck

  10. pablo says:

    Excelente, como siempre. Gracias!

  11. BOb says:


    • Ciro Sannino - Auth says:

      Hi Bob,
      so if « the render is complete and I need a mask on the fly » (as I write in the post)
      you render again with ID?

      Great job!!! 😛
      But I dont’ like waste my time.

    • Ciro Sannino - Auth says:

      Hi Bob,
      please read the introduction. Contextualization is really important.
      ( « How to make it faster if your render is already done? » )

  12. Carlos says:

    This is a good method to create a mask on the fly, indeed. The only problem to me is concerning a very selective client that understand a little more about light, colors and its physical effects. I say this because even though the wall color have changed, the scene didn’t receive the contribution of the color, that would bounce around the place and change the atmosphere of the scene, even if just a little.

    But I’m not saying that this method is wrong, just that if the client is a very selective one, he/she may want to see this color bleed in the scene. But also, there is the very good point in this technique that you can use this manipulated image just as a way to see if it is close to what the client wanted, just to give him/her an idea if it is close to what he/she expected and get the approval. Also it would be his/her fault to have this change of mind and go back on the initial idea/design/etc, but I know that as the professionals that we are and taking into consideration the human aspect of this area, we have to accept certain situations. As we work with people this should be taken into consideration as well. hehe

    Sorry for my bad english and if I sounded arrogant, just stated my opinion. In fact, I liked very much of this technique and it was only after that I thought about the color bleeding. I would also like to say that your initiative to help people sharing your knowledge and experience is remarkable, as well as the content of this blog. Keep up the good work! =]

  13. Vinicius says:

    It is very cool, Tnx Ciro again

    This technique helps a lot in the case of two or more ideas for the environment or object.
    Since we know that the post process in Photoshop is essential, because for the most perfect rendering always has to improve,


  14. niuniu says:

    I look forword a better tomorrow.

  15. MGLPALACIOS says:

    Hey, Ciro, what good tutorial, congratulations, I hope that you keep up.

  16. Adrian says:

    Personally I always render with wirecolor vray element
    it’s better than render ID, just assign random colors for creating objects and voila

    after render you have great mask for EVERY object, not only for walls like in this tutorial

  17. designman says:

    Thanks a lot for sharing it.

  18. jone says:

    Thank you .It interesting

  19. Federico says:

    08/02/2011 – 1:51am

    This just saved my life. Got some images to deliver in a few hours, and this saved me HUGE TIME.

    Thanks, from Salta Argentina!

  20. papayak04 says:

    Great! it extremely meets my need.
    I refer to my co-work, they like it

  21. papayak04 says:

    i wonder that i could forget assign render scanline, and at the end replace it by save immage as .tif with button ” create chanel map”

  22. Buhari says:

    Thanks for giving this kinds of designing tips. wishing a very good day &all the best

  23. Arpit says:

    This is really a super technique…………..Will help me save a lot of time for sure………….Thanks.:)

  24. vikoum says:

    Hi to everyone!

    Ciro I used your method. but it took me quite a long time. Later, I found that in render elements you can choose wire color element and have the same result, I think so, with the script “random wire color” as Vasiliy Chaban said before.
    I haven’t use this script yet, but lately i use a lot many render elements and I add recently the wire color.
    It helps me to choose every object quickly, change their colors, and not only, and manipulate them very easy.

    • Ciro Sannino - Auth says:

      Yes Vikoum,
      thank you for your comment. The point is this method is universal and you don’t require vray to use it 😉
      If you’re working with vray use wire color: it’s really helpful as you say 🙂

  25. shas says:

    thanx for giving like this type of tips .. its very helpfull to improve my skills

  26. vittylokanath says:

    thanks for this tip.its more useful

  27. Hina Chitalia says:

    Hi Ciro,
    I am new for Photoshop .so, In this video your Photoshop version is not in English Language .so,I can’t understand fully .Can you send it in English language.

  28. Linkon says:

    Sir Ciro,

    This is surely an awesome technique !! 🙂 But, the link isn’t working anymore :((

  29. Patrick Tay says:

    Save time,nice work

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