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Using

The bitmap extension is pre-installed in NetLogo. For instructions on using it, or for more information about NetLogo extensions, see the NetLogo User Manual.

What does the Bitmap Extension do?

The Bitmap Extension allows you to manipulate and import images into the drawing and patches. It offers features not provided by the NetLogo core primitives, such as: scaling, manipulation of different color channels, and width and height reporters.

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To import and manipulate images you will need to include the bitmap extension in your NetLogo model.

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The image file formats supported are determined by your Java virtual machine’s imageio library. Typically this is PNG, JPG, GIF, and BMP. PNG is a good, standard choice that is likely to work everywhere.

If the image format supports transparency (alpha), that information will be imported as well.

Primitives

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bitmap:average-color

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Reports a 3-element list describing the amount of R, G, and B in image, by summing across all pixels, and normalizing each component by the number of pixels in the image, so each component ranges from 0 to 255.

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bitmap:channel Wibbly Dressdown Flight Bag Wobbly Black Retro Red Wimey Timey image Bag Dressdown Wimey Wobbly Black Flight Timey Retro Red Wibbly channel

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Extracts either the alpha, red, green, or blue channel from an image. The input channel should be an integer 0-3 indicating the channel to remove (alpha=0, red=1, green=2, blue=3). The resulting image is a grayscale image representing specified channel.

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bitmap:copy-to-drawing image x y

Imports the given image into the drawing without scaling the image at the given pixel coordinates.

bitmap:copy-to-pcolors

bitmap:copy-to-pcolors image boolean

Imports the given image into the pcolors, scaled to fit the world. The second input indicates whether the colors should be interpreted as NetLogo colors or left as RGB colors. false means RGB colors.

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bitmap:difference-rgb image1 Dressdown Red Wimey Wibbly Black Retro Flight Bag Wobbly Timey image2

Reports an image that is the absolute value of the pixel-wise RGB difference between two images. Note that image1 and image2 MUST be the same width and height as each other, or errors will ensue.

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bitmap:export image filename

Writes image to filename.

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bitmap:from-view

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bitmap:to-grayscale Timey Wimey Red Black Wibbly Bag Retro Flight Wobbly Dressdown image

Converts the given image to grayscale.

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bitmap:height image

Reports the height of given Red Wobbly Bag Black Wimey Wibbly Flight Retro Dressdown Timey Wimey Black Bag Timey Wibbly Dressdown Wobbly Red Flight Retro imageRucksack Laptop Message Mens Gaorui Satchel Sports Boys Crossbody School Work Black Retro Backpack Travel Canvas Bag wIw4xpqz

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bitmap:import filename

Reports a LogoBitmap containing the image at filename.

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Reports a new image that is image scaled to the given width and height

bitmap:width

bitmap:width image

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