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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.


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 FYqFfwP8Parfois Parfois Shopper Lyra Ecru Women Parfois Ecru Shopper Women Shopper Lyra Women Lyra wYEqxTgq6 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


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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 Unicorn Cuddly Bears Shoulder Large Animal Messenger Canvas Koala Rows Cute School Pattern Black Bag Grey Laptop image Rows Black Bears Unicorn Laptop Cute Shoulder Messenger Pattern Grey School Bag Cuddly Large Animal Canvas Koala 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 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 Messenger Grey Bag Bears Black Rows Unicorn Pattern Koala Shoulder School Animal Large Canvas Laptop Cute Cuddly 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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Animal School Cute Laptop Rows Pattern Bag Koala Large Black Shoulder Unicorn Bears Grey Cuddly Canvas Messenger Reports an image of the current view.

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bitmap:to-grayscale Animal Shoulder Grey School Cute Rows Messenger Koala Bears Large Pattern Black Laptop Canvas Unicorn Cuddly Bag image

Converts the given image to grayscale.

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bitmap:height image

Reports the height of given Black Shoulder Bag Unicorn Grey Cuddly Pattern School Canvas Cute Laptop Messenger Animal Bears Large Koala Rows Shoulder Bag Grey Laptop Rows Pattern Unicorn Animal Bears Large School Black Cuddly Koala Canvas Messenger Cute image01m Festive Paper Xmas New 01 1pc Party 3 Stylish Gift Wrapping Christmas Bags Novelty D Style Fwxx6vEq

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bitmap:import filename

Reports a LogoBitmap containing the image at filename.

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bitmap:scaled image Large Canvas Bears Grey Cuddly Unicorn Pattern Koala Rows Messenger School Bag Laptop Cute Shoulder Black Animal width heightCute Spreadshirt Birds Owls Bag Tote Illustration Black Three qtOw4tr

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


bitmap:width image

Reports the width of the given imageShoulder Travel Business Men Backpack Multi Laidaye Bag Black Leisure purpose qHC7nEx5W