Basic Drawing Guide

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Basic Drawing Guide

Postby mhavlovick » Wed May 20, 2015 1:30 am

Before going through this guide, make sure you have successfully connected to the QuickDraw and loaded the Sketchy Web Application in your browser.

See if you need help in connecting to your QuickDraw.

On the main Sketchy web page, there are 3 tabs. Image, Settings, and Advanced.

In this guide, we are just going to explain the basics of loading, rendering, and drawing images.

On the main "Image" tab page there is a "files" table that contains both "Source" and "Rendered" files. "Source" Files are the files that have been uploaded, but need to be rendered first in order to be drawn. "Rendered" Files are files that have been previously rendered and are ready to be drawn. Therefore, the "Render Image" will not be available for rendered images and the "Draw Image" will not be available for source images.

To render a source file, select a source file and click the "Render Image" at the bottom of the table. A popup will display with many options that can be selected to alter the way the image will be rendered. They are described as follows:

- Drawing Size: This is a drop down list that displays all the drawing sizes (in millimeters) you have defined for your QuickDraw Machine. Select the correct size based on the paper or drawing area you would like the picture to draw in. If the drawing size you want is not found in the list, you need to add more drawing sizes to the "Drawing Sizes" settings by going to the Settings tab->Drawing tab. Drawing sizes are defined by the width in millimeters x height in millimeters, such as "200x250". Make sure to click "Save" once you've added the new drawing sizes.

- Pen Width: This is the approximate pen width for the pen that will be doing the drawing. Setting an incorrect pen can cause too wide, or too thin of lines in the final drawing. Experiment with a value that works best for the pen you are using. Many pens actually draw with a smaller width than described on their packaging.

- Render Options: "Normal" is best for line drawings. "Halftone" is a dithered or stippling type of effect, using dots to simulate shading. "Edge Detection" attempts to create a line drawing from picture type images, but requires an image with high contrast. You can also "Invert Image" if desired.

- Center: Used to center the image Vertically, Horizontally, both, or none.

- Rotate Image: Rotates the image the desired amount. Best for switching landscape images to portrait by rotating 90 degrees

- Flip Image: Used to flip the image Vertically, Horizontally, both, or none. Best used when printing letters on glass and viewing from the other side.

- Contrast: Used to give more contrast to the image, making dark areas look darker and the white areas look whiter.

- Brightness: Used to darken or lighten the image.

- Threshold: Threshold is used to determine how dark an area of the drawing should be in order to draw it on the paper. A lower threshold will usually cause the final image to be darker and a high threshold will usually cause it to be lighter.

One the options are set, you can then click the "Render" button, or click the "X" at the upper right corner to exit, if you wish to cancel the Rendering.

Once the image is rendered, it will automatically select this rendered image (as a sub item underneath the source image) and display it. If it looks correct and you want to draw it, click the draw button, otherwise you can click back on the source image and render it again with different values until you are happy with the result, then click "draw".

You can delete rendered images that you don't like by selecting the rendered image and clicking the delete button. You can also delete a source image and all of it's rendered images by clicking on the source image and then clicking delete.

Use the "Upload File" button to uploading new images to draw.
Matt Havlovick
Owner/Maker - QuickDrawBot