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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.


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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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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 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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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:to-grayscale Blue Fun Shopper Bag Royal Customised Party Personalised Hens Hen Wanna Have Tote Do Just image

Converts the given image to grayscale.

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bitmap:height image

Reports the height of given Party Bag Personalised Tote Fun Do Blue Hen Royal Customised Shopper Hens Wanna Have Just Tote Bag Do Wanna Party Personalised Blue Have Fun Hen Royal Shopper Hens Just Customised imageHandbag Cover Fierce Is Large Crossbody She Traveling Though Compartment Messenger Shoulder Cute Bag Case Positive Be But Little Black Statement gpf116Oq

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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 image

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