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Author Topic: Death 2 Sharpie 1st go
JinjaBeard-
y
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JinjaBeardy
Post Death 2 Sharpie 1st go
on: November 5, 2015, 16:24
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After playing around with the brilliant Death To Sharpie sketch by DullBits (thanks for the pointer to that, Sandy) and finally getting my Polargraph going again with Sandy's most excellent help, I've finally managed to produce some actual, on yer-dead-tree drawings!

I took B&W photos, resized to be approximately 1000px on the long edge, adjusted contrast and then ran through the Death To Sharpie sketch (much parameter enfiddlement ensued). I then did the Gcode import into v1.2 of the controller, and drew the output on A2 using Tombow pens (which will last a whole 24hr+ drawing session).
Full size version can be seen on Flickr, should you so desire, where I am known as AgentX-2-0.
https://flic.kr/s/aHsjC5y7Xp.
Comments welcome!

Image
Image

I'm still breathing and it's better than the alternative

reconlap
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Posts: 7
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Post Re: Death 2 Sharpie 1st go
on: November 5, 2015, 18:42
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Hi Jinja,

Lovely drawings, been playing with Death To Sharpie and my Polograph for a couple of weeks now and I must say I'm impressed with your results. You seem to be having much better luck getting the shades to come out in the drawings than me, Mine tend to end up more black and white. Think it might have something to do with me not scaling the image properly in DTS. I'll enjoy playing with it more and finding out.

I've attached some pictures of my results, please ignore the couple of stray lines in the Easyrider one, had some mechanical issues which I hope to have fixed.

Image

Image

Hope to see more of your drawings.

Regards

kongorilla
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Posts: 321
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kongorilla
Post Re: Death 2 Sharpie 1st go
on: November 5, 2015, 18:47
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@Jinja - Very nice! I've found it very hard to get the settings right with Death To Sharpie, but it seems you've found the recipe. Any tips you could pass along?

BTW (everybody), adding your drawings to the Drawbots Flickr group would class up the joint:
https://www.flickr.com/groups/2164129@N25/

JinjaBeard-
y
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Posts: 38
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JinjaBeardy
Post Re: Death 2 Sharpie 1st go
on: November 6, 2015, 08:16
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Thanks for the comments both, glad you like them. @reconlap, the Easy Rider one in particular looks pretty nice, look forward to seeing how you develop that.

@kongorilla, as you might imagine there were several poor attempts before I started to get things I liked 🙂 The first thing I did was to ditch sharpies - the Tombow pens give consistent results over the life of the pen, particularly in line width and ink flow. I also don't use a black pen - the code that comes out overdraws the dark areas a lot so it will end up saturated so I use a dark grey or medium grey.
On the image prep front, I have a large library of B&W negs from when I had a darkroom so I have been using those, though I do have some from colour images in the works that seem to be coming out ok. Anyway, I desaturate (if colour) then adjust the image to reduce contrast and get the broadest possible range of greys. For both pictures I removed clouds in the sky completely as they just distracted from the image. also, for the Kings cross one I had to manually add a darker line for the very top edge of the building as it just wasn't coming out in D2S.
Then I do literally dozens of D2S renderings, tweaking the parameters constantly.
I adjusted the on screen output to get it as large as possible so I can see the results better, but I found that fiddling with the paper size settings has a dramatic effect (usually detrimental) so I pretty much leave 'em alone.
For the main fiddlable parameters I had these for example for the Church image:
final int squiggle_total = 650;
final int squiggle_length = 700;
final int half_radius = 3;
final int adjustbrightness = 5;
final float sharpie_dry_out = 0.0;
final String pic_path = "Church1a.jpg";

I added a couple of my drawings to the Polargraph Flickr group as you suggested.
I'll post a bit more later when I have more time. Off to work!

I'm still breathing and it's better than the alternative

JinjaBeard-
y
Beginner
Posts: 38
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JinjaBeardy
Post Re: Death 2 Sharpie 1st go
on: November 7, 2015, 12:54
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To continue..
I start by playing with the brightness to get an overall nice look, adjusting up or down by 2's or 4s and finally in single steps until I thinks it's ok. Then I play around with the squiggle_length and the squiggle_total to try and bring out details that aren't showing up nicely, usually up/down by 200's at first then smaller increments until I think its as good as I'm going to get. I try and be disciplined and only fiddle with a single parameter between each run of the sketch. Sometimes I go back to the original image and tweak the curves or the brightness/contrast a bit, or adjust the resolution. Generally I find 1000-1200 pixels by 700-800px is a good starting point but it varies from picture to picture. Oh, and I added a border too.
Just for reference (and in case anyone wants to have a go with them) here's the original photos I used:

Image
Image

I'm still breathing and it's better than the alternative

kongorilla
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Posts: 321
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kongorilla
Post Re: Death 2 Sharpie 1st go
on: November 7, 2015, 21:34
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Thanks for the detailed write-up, JingaBeardy. I put Death to Sharpie experiments on hold until I finish building plotters that use Koh-I-Noor Rapidograph pens, so I can draw with custom inks; I came to same conclusion you did regarding using black inks. Ballpoint looks good, though. Still, I found it hard to get the plot out of the dark values fast enough without over drawing every mid-value area as well. Very touchy parameters.

It'd be nice to get the output as SVG, so errant squiggles could be deleted. Like, why did it draw those squiggles on the sky borders of your Kings Cross drawing? All my drawings have something like that as well.

Maybe we could coax an appearance by Scott Cooper in this forum. Some recommendations from him would probably save us much time and art supplies.

krummrey
Advanced
Posts: 66
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Post Re: Death 2 Sharpie 1st go
on: November 10, 2015, 21:21
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@kongorilla Processing doesn't export SVGs natively but it has PDF export.
I changed a few lines and uploaded the resulting sketch to my Blog.

Death to sharpie with PDF export

kongorilla
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kongorilla
Post Re: Death 2 Sharpie 1st go
on: November 10, 2015, 22:59
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@Krummrey - COOL! Thanks! I'll try it soon. 🙂

edit: Just exported the default image...WOW! It's cool to get a good look at the exported lines in Inkscape. They have a more angular character than I had previously appreciated.

JinjaBeard-
y
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Posts: 38
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JinjaBeardy
Post Re: Death 2 Sharpie 1st go
on: November 19, 2015, 10:48
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@krummrey - thanks for that, I'll look forward to playing with that 🙂
In the meantime, here's another D2S drawing I have done (link to flickr) https://flic.kr/p/BgJBQe
- @kongorilla, when you said the parameters are touchy, boy is that ever the case! I spend literally hours twiddling them. Apologies for the poor photo, I'm going to get a better one when I get home (at some point).

I'm still breathing and it's better than the alternative

reconlap
Newbie
Posts: 7
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Post Re: Death 2 Sharpie 1st go
on: November 30, 2015, 22:37
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Hi,
Just wanted to drop by and share a useful feature for preprocessing images in gimp for D2S. I found the "Cartoon" filter in gimp and suggest D2S users give it a try, I find it's a quick and easy way to get D2S to pick up more detail from an image that it often misses. You can find it in in filters->artistic->cartoon .

It really helped D2S show the stonework in the drawing below.

Image

Have fun playing with it and hopefully some will find it helpful.

regards

Redlynch-
College AU
Newbie
Posts: 7
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Post Re: Death 2 Sharpie 1st go
on: May 12, 2017, 00:19
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Hey guys,
D2S is very cool.. however,
When i try to open the files in Processes it seems to want to make a new folder for that file and then it wont work..
any thoughts

cheers

jcliff
Newbie
Posts: 9
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Post Re: Death 2 Sharpie 1st go
on: June 22, 2017, 21:27
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the pdfs import into inkscape a bit slowly for my liking, so I hacked together svg output in the script. Output is file per pen as per the gcode rather than all in one.
fork is here:
https://github.com/jwcliff/Drawbot_image_to_gcode_v2

sammie
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Posts: 2
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Post Re: Death 2 Sharpie 1st go
on: June 25, 2017, 07:12
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I tried to load the Gcode into the Polargraph Controller but it doesn't work. Also SVG files are giving me a black rectangle surrounded with some lines. Can you give me some advice about this, what am I doing wrong here 🙂 ?

sandy
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sandy
Post Re: Death 2 Sharpie 1st go
on: June 26, 2017, 23:14
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Sammie, your description is so vague that I don't think I can help.

sammie
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Posts: 2
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Post Re: Death 2 Sharpie 1st go
on: June 28, 2017, 07:17
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Quote from sandy on June 26, 2017, 23:14
Sammie, your description is so vague that I don't think I can help.

From the post that jcliff made I downloaded his fork
quote"
the pdfs import into inkscape a bit slowly for my liking, so I hacked together svg output in the script. Output is file per pen as per the gcode rather than all in one.
fork is here:
https://github.com/jwcliff/Drawbot_image_to_gcode_v2"

Attached is one of the files (they are seperated in different pens so this is just one example part of the six files that are made.) This is one of the original PEN files that is made for one drawing so it still has the original extension (.txt) LINK: https://drive.google.com/open?id=0B5KhK31JN6LHWjc1bzY1OC1aM00

After renaming this file into a .gco or a .g extension the Polargraph Controller software doesn't load it. So my question is just this: what's wrong with this file? Can I use it with the Polargraph Controller software or do I need to change something in it?

What I've tried:
renamed the file into .gco and .g
removed the first part of lines untill the G1 commands started
removed the few lines at the end of the file
loaded it into the Polargraph Controller software as a Vector file
imported it as a queue into Polargraph Controller software
importd the .SVG file (see here what it looks like : https://drive.google.com/open?id=0B5KhK31JN6LHeGlRQzJoVnEwaGs

Thanks,
Sander

SCooper
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Posts: 1
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SCooper
Post Re: Death 2 Sharpie 1st go
on: July 6, 2017, 19:42
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I have updated the https://github.com/Scott-Cooper/Drawbot_image_to_gcode_v2 code to output SVG files. I was inspired by the fine work of John Cliff. Each pen is kept as a separate group/layer.
Hope this reduces some of the pain points.

Thanks John for pushing this forward.

kongorilla
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Posts: 321
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kongorilla
Post Re: Death 2 Sharpie 1st go
on: July 6, 2017, 20:25
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Thanks for your work, Mr. Cooper!

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