Episode 057: BLOOD!

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This week I have a guest on the show. Philippe Demartin from Chile shows how to make letters out of blood without pain and no need to clean up afterwards.

EDIT: Be sure to read the two comments from eBrnd below. They are really good additional material for this show!

gimpusers.com has a nice tutorial about this which influenced this show.

No Gimps were harmed in the process of making this podcast!

Just an afterthought: You can use the bumpmapping also with photographies, inserting your logo for example. I’ll look into that.

Next week will see the publishing of the first product of the MTG-Plugin Factory. ;-)

Creative Commons License This work is licensed under a
Creative Commons Attribution-Share Alike 2.0 Germany License.

26 thoughts on “Episode 057: BLOOD!

  1. What for an error do you get? Which program and OS?

    I used a new way to encode the video because the old method claimed to be a MP3 file since some weeks.

    I am just encoding it with the old method and will post a link to an alternative download here.

  2. I have also attempted the download. Interestingly, your webpage states the file should be 37.1mb, but when I attempt to download, I am only receiving a 12.7mb file (both times I downloaded it), and firefox states that it was a complete/successful download.

  3. I have the same effect. Strange.

    I’ll upload the new file in a moment, it’s still rendering.

    uploading….

    still uploading – the old file was truncated. Upload reported success. :-(

    New file is there.

  4. Hi!

    I have two little things to add about today’s show.
    First, the way of rounding letters. If you do it with a blur and threshold-way, you always get jagged edges, because threshold knows either white or black, nothing in between. Using the curves or levels tool and pulling the white and black points all the way to the middle (like 5 or 10 steps left and right of your “threshold”) gives much smoother results. (Your curve should look like __/‾‾)

    The second thing is a quick explanation of the concept of an environment map: It’s used when modeling shiny objects in 3D graphics – the GIMP lighting effects only is a very simple application of that.
    Imagine a shiny object, like the coffe mug that’s sitting on my desk. When I look at it, I not only see the color or texture of the mug, but also a little bit of reflection of the objects around it, and the reflection of the lights in here. While the light reflection itself is modeled by the bumpmap feature, you would use the envoronment map to model the other things. Try taking a picture of a room or a wall with a brightly lit window and using this as an environment map. The photo should be taken from the point where the environment-mapped object is supposed to be, and I guess a wide-angle lens is helpful.

    Environment maps are often used in video games where “real” light processing would be too complicated for the graphics processor to handle in real-time.
    Or when you don’t have a 3D model of the environment, like in the GIMP lighting feature.

  5. Argh, I forgot to add…

    Another way of rounding corners of letters:
    Write your text with the text tool, then click Layer – Path from text. Select the Background layer (or some other layer you want the text to be on), then go to the paths dialog and click the stroke path button. Don’t stroke it on the text layer because then it’ll get cut off at the edges. Select the rounded ends and rounded corners under Line style in the stroke path dialog (From those six little buttons directly under line style, click the two in the middle), then click okay.
    You can merge down the original text layer now, because without it you’ll only have the outline of the text, and there’s no need to move it or change it – you’d have to make a new path and stroke it anyway.

    You might want to use a regular or narrow width font, and push up the letter spacing a bit because the stroke adds some width to the letters.

    This way of rounding the corners of letters gives a totally different result – maybe not useful for bloody text because it’s straighter, but als a nice effect.

  6. I thought the inserted commentary and echoing of the techniques worked out quite nicely and added good value to the original from phdemartin. I certainly do not want to imply any shortcomings in the original — just that the inserted material worked well.

    –jim

  7. Philippe has made this video just as a quick video for the forum and me – instead of writing it down. So it’s just a sketch, but a very good one.

    I like the dialogue form – and I use it sometimes in the videos while talking to myself. First the how, then the why. With two persons it’s even better – better to learn because the roles are different.

    Philippe has offered to make more – and I’ll not turn him down. :-)

    eBernd: Really good comments! Tahnk you!

  8. I’d like to thank eBrnd for posting those alternatives. It’s always nice to know there’s more than one way to dio it (as the perl folks say). Knowing the alternatives, one can focus on the differences and choose whatever meets immediate objectives.
    ..jim

  9. Nice surprise: a show about graphical effects.

    Rolf, you seemed a bit puzzled about how to look at the image. Notice that you used as bump map black letters on a white background. Philippe used an inverted bump map. That might explain maybe something.

  10. I was surprised about my perception of concave letters when I expected convex letters because I had not inverted the bump map. But of course there is no such thing as concave or convex – it’s all a 2D trick for the eye and can turn out this way or that.

  11. If you do the old “brightness = steepness of the gradient in the bumpmap in direction from where the light is coming” trick, convex is indeed the same as concave with the light on the opposite.
    But if you do more complicated light computation, it’s only the same if you have a perfectly convex of perfectly concave shape. If the lightsource is low enough, you’ll see shadow near “valleys”, which are not there in the inverted version with light from the opposite.

    I made a little illustration to make that a bit clearer: http://88.80.200.158/zeug/bumpmap.png

    Hmm.. I played around with the lighting effects a bit – GIMP seems to be using the simpler approach and not care about shadows.

  12. hi :) i guess this is a video tutorial for the one i made 1-2 years ago for gimpusers.com.

    Philippe Demartin: did you use my tutorial as a basis? if so – can I link the tutorial from our video tutorials page?

    thanks!
    bernhard

  13. devvv, the thread in the MTG forum started with a link to your tutorial in the German version because the requester of this topic is from here too. Before I could tackle this problem Philippe offered to make a tutorial and spare me the work to read through yours. ;-)

    So your work kicked this off. Linkj is included in the blog entry now.

    I try to include links that I have used or that I find helpful in the blog postings. But sometimes I forget where I read something or even why I know it. If I forget something, just drop me a line.

  14. hi again!

    no problem at all for me! its all published under cc-licence. thanks for your answers ;) great video, i will link it as soon as i’m home again!

  15. ok great show…but now what if I want my bloody text to be on an arch? I was following along and trying to get it to be on an arch as well and couldn’t figure out how….

    Anyone for doing a text on an arch, or in a circle tutorial?

  16. Here’s a TOC:

    http://meetthegimp.org/episode-057-blood/
    Episode 057: BLOOD!
    00:18 Welcome
    00:30 Meaningful black script
    01:24 Dripping blood request
    02:15 Phillipe begins
    02:45 Start with normal text
    03:55 Blur and threshold to make letters fatter
    04:55 Draw drips using paint brush then blur and threshold again
    07:55 Threshold and blur summary from Rolf
    09:40 Create two new layers for letters and shadows
    11:10 Blur the bump layer
    12:15 Use the lighting effects filter bump map to make the letters look 3D
    13:30 Blur the shadow layer and offset it
    14:25 Summary of lighting effects filter by Rolf
    20:15 Thanks to Phillipe
    20:40 What’s coming up
    22:07 The End

  17. Pingback: MTG: Обзоры выпусков за весь 2008 год! « Блог фотолюбителя :)

Anything to add from your side of the computer?