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Crayon FAQ / HELP

Crayon - clker.com tracing tool

Summary

Crayon is a tracing tool intended for creating clip arts out of photographic images. To start the process, draw scribbles identifying the background region. Click on + to add a new object and draw a scribble inside only one object. Repeat for every object. Once all objects are marked click on the segment button and watch.

Step #1
Step #2
Result
Scribble on the background around the main object Click + and scribble on one object. Repeat for every object. Click on the segment button. If you color the result, your final output will be similar to this.
See video here



FAQ

  1. How do I reach Crayon on the website?
  2. What are the functions of every toolbar button?
  3. Did you limit the size of the image because your tool is free ?
  4. What is the best practice recommended image size ?
  5. Which will get better results: colored, greyscale or lineart images ?
  6. What if the image resolution is high, what should I do ?
  7. How do I color the result picture ?
  8. Why is this tool very slow ... it's getting on my nerves ?
  9. Do I have to scribble over every object in the image ?
  10. How long did it take you to complete the example at the top ?

1. How do I reach Crayon on the website?
  1. Upload a raster image ( .jpg or .png )
  2. Click on My-Cliparts at the top of the screen
  3. Click on you recently uploaded image
  4. Click on convert all or part of this image to clipart


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2. What are the functions of every toolbar button?
Save as button Saves the resulting vector trace to your profile. The result will appear in people's searches for cliparts, and will appear under you My Cliparts page.
Exit button Ends your tracing session, and returns to the clipart page.
Hand tool Enables you to pan and move the image.
Zoom in tool Allows you to zoom in up to 8X.
Zoom out tool Allows you to zoom out up to 0.125X.
Undo seeding actions Undoes the Pencil / Seeding and the Eraser action. You can undo a scribble or a seed that you drew with the pencil tool. You can also undo erasing a scribble.
Redo undone seeding Redoes undone seeding and scribbles. Once you draw another scribble, the undo buffer will be overwritten from the that point, and you will not be able to redo actions that were undone at that point.
Add a new object Adds a new object, selects a random color for seeding that will be used by the user to scribble over the object. The object will be called unnamed, which you can change and will not be assigned a fill color.
Pencil tool The pencil tool uses the current pencil size to draw scribbles to identify the region occupied by the current object.
Eraser tool Uses the current pencil size to erase scribbles drawn in the wron regions.
Brush size tool Changes the point size of the pencil. The sizes are 1,3,5,7,9,11,13,15,17 and 19. The center point is always the mouse cursor hot spot. Every click on the button will switch to the following size, and will finally return back to 1.
Eye dropper tool If you have an image composed of relativley constant non-gradient colors, the eye dropper helps you pick a color that represents an object. For example, if you have a picture of a person wearing a red hat and the hat is the only red object in the picture, you can then use the eye dropper for that purpose. Click on the + icon to add an object, select the eye dropper, click inside the hat and click on commit selection in the options bar at the right side of the screen.
Resize tool Reduces the dimensions of the image to 75% of the original.
Segment tool Based on your scribbles, the image will be segmented and vectorized.
Bug / Feature File a bug or request a feature.
Help Opens this webpage.


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3. Did you limit the size of the image because your tool is free ?
We did not place any artificial limits on the size of the image that you can process. The size of the image is limited by what the flash virtual machine can process, and I believe it is 4095x4095 in flash 10. Larger images will produce lots of noise along the lines and will take longer time to process.

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4. What is the best practice recommended image size ?
We got best results when the main object to be traced is less than 1 mega pixel. The example at the top is 256x256, 0.06 Mega Pixel. The size of the object you are tracing is usually smaller than the size of the image. For example one might have a 4 mega pixel image (2000x2000) however, if the picture of a mouse inside the photo is like 400x400, I expect that you will get good results.

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5. Which will get better results: colored, greyscale or lineart images ?
Colored images have more information than greyscale, so they are better. Pictures with plain colors produce better results than textured images.
Trace lineart images only if they have low details. If the lineart image is full of thin lines and cross-hatched lines, it will take very long time to process. At that point I recommend using potrace instead of crayon.

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6. What if the image resolution is high, what should I do ?
Draw a background scribble around your object, then click on crop excess background. If the resolution is still high, click on the downsample button

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7. How do I color the result picture ?
After you're done with segmentation and vectorization, select one object at a time from the drop down list box. Check use fill color, then click on the rectangle under it. Keep the dialog open and click on the list box and select another object. Click on use fill color again, then move the color chooser. Make sure to click Ok at the end.

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8. Why is this tool very slow ... it's getting on my nerves ?
Well.... it runs on a virtual machine..... so let's hope Google finishes their native client project.

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9. Do I have to scribble over every object in the image ?
No. Scribble background around the main object you want, and scribble with new objects inside the parts that make up the object you want to trace. In the example at the top we totally ignored the carpet she's jumping on.

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10. How long did it take you to complete the example at the top ?
Approx. 4-5 minutes including coloring. I have been using crayon for while now.

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