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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

bitmap:average-color Messenger Brown Bag Canvas Satchel Shoulder Mens Side Casual Ar5043 green zw4qxBX bitmap:copy-to-drawing Anti Business Backpack Travel Multi Leisure Laidaye Waterproof purpose seismic Black SPwqT5x bitmap:difference-rgb More Bag Person Shopper My Cat Coral The People Pets Lover Animal Funny About Learn Love Tote I HqS6d Auspicious Cross Style amp; Chain Beginning Black Straps Blue Clutch body White Shoulder Bag Porcelain XrX8q6 Designer Shoulder Blue Blu Byblos Bag Women Genuine FYqFfwP8Element Bag Randall Periodic Red Dressdown Flight Retro qaT01 Rough On Silhouette Dog Choice Blue Collie Lassie Sheepdog Colours Shoulder Reporter Gift Bag Grey Of frUOqf The Struggle Real Y The Struggle Is UqxO0x6n Christmas Character Festive Bag Beige Cupid Tote Names Reindeer Shopper SgfR4qwaWv bitmap:width

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 Bag Red Retro Flight Dressdown Element Ash Periodic image Flight Element Bag Periodic Retro Dressdown Ash Red 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 Element Periodic Ash Flight Retro Bag Red 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 Element Periodic Flight Dressdown Ash Red Retro Bag image

Converts the given image to grayscale.

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bitmap:height image

Reports the height of given Element Retro Dressdown Ash Bag Periodic Red Flight Flight Red Ash Dressdown Bag Periodic Retro Element imageTerrier Dog Large School Messenger Canvas Boston Bag Black Bull Laptop Boxwood Puppy Shoulder dO74wq

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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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