Sketchie



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User Guide for Sketchie 1.0

Click here for the Sketchie 2.0 User Guide



How it works


Sketchie works by drawing "pencil" or "brush" strokes on the screen in continuous cycles. During each cycle, Sketchie draws a number of strokes on the screen, and as more cycles complete more and more strokes appear. Over time the image on the screen begins to resemble the original image.


Interesting effects can be achieved by changing the thickness, length and number of strokes, as well as other characteristics of the image, including the colour saturation, hue and brightness etc. Changing colour images to greyscale, inverting the colours in an image, or treating a greyscale image as colour often results in visually stunning effects.



Selecting a starting image


Select an image for Sketchie to work on by touching Camera to use the camera (if present) to take a new photo, or Open Albums to select an existing image from an album.


If a camera is present and selected, the camera will appear with a shutter button Shutter, a self-timer Timer, a button to switch between the front and rear cameras (if present) Switch Camera, and a cancel button Cancel.


The image selected is the "target" image for Sketchie's rendering process - this is the image that Sketchie will try to duplicate by drawing "pencil" or "brush" strokes to the screen.



Rendering the image


Start rendering by touching Play and stop rendering by touching Stop.


Sketchie always uses the image on the screen as its target image, so touching Play again after touching Stop will start rendering with the previously rendered image as the target image.


Re-rendering a previously rendered image can produce interesting visual effects. For even more interesting effects try changing the image appearance and rendering settings before re-rendering an image.


Save the image on the screen by touching Save. The image can be saved to the photo album (or photo roll if a camera is present), uploaded to facebook, or emailed.


Photos taken with the camera by Sketchie are not automatically saved to the photo roll or any album. If you want to save the original of a photo taken by Sketchie, touch Save before touching Play.



Changing the rendering settings


TouchTools to access the toolbar.


On the toolbar, touchAnimationto change the animation controls. The animation controls vary the number of cycles the animation runs for, and the speed at which each cycle is drawn to the screen.


Changing the number of cycles will change how closely the final image resembles the target image. More cycles produces images that more closely resemble the target.


Changing the speed makes the animation go faster or slower. A slow speed means Sketchie will take longer to get to the final image, and the animation will appear a little like a movie.


TouchBrushto change the pencil/brush strokes controls. The "Strokes" controls vary the number of strokes drawn in each cycle, the maximum length of the strokes, and the thickness of the strokes.


Changing the number of strokes drawn in each cycle will change how closely the final image resembles the target image, and how quickly the resemblance emerges. More strokes per cycle causes images resembling the target to emerge more quickly.


The strokes drawn by Sketchie vary in length. Changing the maximum length of each stroke has a similar effect to changing the number of strokes, but also produces different visual effects.


Changing the thickness of the strokes drawn produces different visual effects. Thin strokes produce images that resemble pencil drawings; thicker strokes produce "painterly" or "scumbled" images that resemble images painted with a brush or palette knife.


Rendering an image with many long, wide strokes will take longer than rendering with fewer, shorther and thinner strokes. More strokes, longer strokes and wider strokes will all paint more pixels on the screen during each cycle, and more pixels means more time. If each cycles seems to be taking too much time, try reducing the number, length or width of the strokes.


Touch Back to return to the main menubar.



Changing the image appearance


TouchTools to access the toolbar.


On the toolbar, touch Modes to change the mode of the image on the screen. Image modes available are "Greyscale" (change the image to a greyscale image), "Sepia" (change to a sepia image), "Colour" (change a greyscale image so it is rendered in colour), and "Inverse" (invert all colours in the image).


Touch Palette to adjust the appearance of the image on the screen. Adjustments available are "Brightness/Contrast", "Hue/Saturation/Lightness" (for colour and sepia images only), and "Red/Green/Blue" (colour and sepia only).

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Touch Resolution to adjust the resolution of the image on the screen. The image resolution (width x height) is displayed in pixels.


Higher resolution images will take more time to render than lower resolution images. Lower resolution images are suitable for displaying on the screen; higher resolution images are better for printing.


The real-time response of the image adjustment controls (e.g. Hue, Saturation and Lightness) is disabled for large images. The controls will still adjust the appearance of the image, but the image will only be updated when the control is set - the image will not be updated in real-time as the control is adjusted.


Loading and rendering very large images will consume large amounts of memory and could cause faults to occur due to low memory conditions.


Touch Back to return to the main menubar.



Changing the settings


TouchTools to access the toolbar, then touch Settings to access the settings.


The "Auto resample image" setting is used to control the initial resolution of images loaded from a photo album or camera.


If the switch is ON, when an image is loaded that has a resolution greater than the resolution of the device screen, the image will be resampled to match the resolution of the device screen.


If the switch is OFF the original resolution of the image is retained.


The "Log off facebook" setting is used to control access to facebook for uploading images.


If the switch is ON, facebook logon details will need to be entered for each upload to facebook.


If the switch is OFF, facebook logon details will only need to be entered once and will be retained for each subsequent upload. Facebook logon details will need to be entered again if Sketchie is restarted.


Touch Back to return to the main menubar.



The best way to see what Sketchie can do is experiment with different control settings and target images and see what emerges!



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