Pencil Overlay

pencil_overlay_main02

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By Sid Porobic

This tutorial stemmed out of the need to produce attractive “hand made” images which are to be used when discussing architectural projects with clients and planning authorities alike. In my experience I have found a need to create relatively abstract images which are to serve the purpose of keeping a project open in the early stages of the design process.

pencil_overlay_main01

The process itself is relatively simple. You will need software like Photoshop which supports layers and blending modes.  Although I personally use Photoshop you may find that open source image editing software could be perfectly adequate for this exercise. Download  Pencil Stroke and Base Image files for this tutorial here.

First you need to load your image file. It could be an image export directly from SketchUp. If that is the case you will need an image with shadows and no edges.

I use so called clay render done in Podium which sports occlusion and transparency.  I also use a rendered image with fully fledged material definition. Most of the preparation of the base image is in adding richness to the base image.

The things I usually go through are adding a small amount of noise and small amount of blur.  This allows me to control contrast in the image better, without creating artifacts. The other thing I do here is changing color either by adding additional layers of gradients or/and filter for manipulating tone mapping.

Second element you need is the image file containing pencil strokes. You either scan handmade pencil strokes or create the image in image editing software like Photoshop. I prepared such a file earlier in Photoshop.  You can further manipulate this file by changing Sharpness, Blur or Contrast. You also could add small amount of Noise if you wish.

These are the prepared base images using the methods described above:

Sponza

Pre-prepared Base Image

pencil

Pencil Stroke Image

1. To begin with you need to open your base rendered image. I normally use Normal Blend mode for this image.

image-1-PS-pencil-layer

Step 1

2. Next thing you do is open your image with pencil strokes. You will need to make sure that the image is as big as or bigger than the base image.

image-2-pencil-layer

Step 2

3. Position pencil image over base image.

image3-pencil-layer

Step 3

4. Now set the Blending mode to Soft Light.

image-4-pencil-layer

Step 4

5. This gives it a nice rich contrast. Adjust the slider to anything between 30% and 60%, subject to your liking. One more thing you could do is selectively erase parts of the image pencil strokes in order to bring variation. If you choose to do that I suggest you use eraser tool with 50 % transparency to allow for smooth transition. Experiment until you feel you are comfortable with the end result.

image-5-pencil-layer

Step 5

6. Once happy with the blend, Merge the image and then do a final contrast and curves adjustment.  There, you now have an attractive ‘hand made’ like image.  I hope you found this tutorial useful and you manage to incorporate it into your daily workflow.

Sponza1

Final Image

Further images using this Pencil Overlay method (base image clay render).

Bournemouth-1

Bournemouth Clay Render

Bournemouth2

Technique Applied

Bournemouth3

Bournemouth Clay Render

Bournemouth4

Technique Applied

Thanks for reading this tutorial.

Cheers

Sid

S. Porobic (AKA ‘Sepo’) Chartered Architect.
Director of – S.Porobic Associates, Chartered Architects and Designers.
Director of – Renderclinic Ltd.
Member of Podium Development Team.
Lecturer at – The School of Arts, University of Northampton.

For any further information regarding Podium training or rendering services you can contact me on renderclinic@porobic.co.uk

20 Responses to “Pencil Overlay”

  1. rcossoli on November 6th, 2009 1:13 am

    thanks, i like this imagens!

  2. Dylan on November 6th, 2009 11:24 am

    It is a very simple method, yet so effective.
    Thanks sepo

  3. admin on November 6th, 2009 11:37 am

    Very effective indeed.
    Thanks, great work!!!
    Mateo
    BTW: Did You know that the Sponza Palace is situated in Dubrovnik ,my
    home city . The original File was modeled by Architect Marko Dabrovic
    in Lightwave. You can download the original file here.

  4. Sid (Sepo) on November 6th, 2009 3:39 pm

    Thank you guys for nice comments.
    Mateo not only that I know but I have been in the Sponza. The model has been used by every render engine that I know to test sunlight and ambient lighting. It is probably the most used 3d model in the world.
    BTW missing drinking coffee on Stradun and watching world go by.

  5. majid on November 10th, 2009 5:41 pm

    Dear Sepo, thanx for sharing.

  6. Sid on November 14th, 2009 5:56 pm

    You are very welcome Majid. I hope you find it useful.

  7. minnow on December 26th, 2009 3:44 pm

    Fantastic!
    Would you like to send me the pencil stroke image since I can’t find the right one. And the images I find on the Internet are with low pixel.
    Here’s my e-mail:
    minnow.chu@gmail.com

    Or would you like to tell me where I can find the materials I want.

    Thanks a lot!

  8. admin on December 27th, 2009 5:59 pm

    I have sent an image, let me know if it is OK.

  9. MINNOW on December 30th, 2009 2:35 am

    I have got the image.
    Thanks a lot!

  10. mohan on January 9th, 2010 4:19 pm

    really cool dude

  11. sid on January 19th, 2010 5:41 pm

    Sorry , missed this….thanks Mateo/James…..MINNOW glad it is working for you.
    Thank you Mohan. :)

  12. dlf on February 24th, 2010 3:48 am

    that’s excellent. simple & effective.
    would you mind me to have the pencil stroke image as well?
    my email is 8mb.king@gmail.com

    really appreciate that.

    thanks.

  13. admin on February 26th, 2010 12:55 pm

    @dlf I have emailed the image too you, hope its OK for you.
    Regards
    James

  14. Sid on March 5th, 2010 11:55 pm

    thanks all for showing the interest.

  15. Peter Beck on April 11th, 2010 2:03 am

    Great tutorial! Great technique! May I also have the sketch image file sent me, perchance? Thanks!

    czeckone@hotmail.com

  16. HuyLinh on May 26th, 2010 5:54 pm

    that’s excellent. simple & effective.
    would you mind me to have the pencil stroke image as well?

  17. admin on May 28th, 2010 11:18 am

    I have sent the image to your email address HuyLin, hope it is OK for you..

  18. Gunther on February 11th, 2012 3:35 pm

    hey there :)
    I know that this tut is in here since a while. just came across it and think that is really nice and helpful !!!

    would really love to have that pencil image in a higher resolution as well. would that be ok ?
    here s my email:
    verkleinert@gmx.de

    thanks a lot !!!

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    [...] Model : Thai Beach House Texture : Sketch pencil Tree sketch : Designpresent_sketch tree Paper texture [...]

  20. msh on January 4th, 2014 5:36 pm

    thanx a lot

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