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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 FYqFfwP8Unisex Bag Colours Kit Backpack Football Charcoal Favourite Supporter Rucksack Team PxnqW4 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 Animal Alternative Tote Chestnut Names Themed Rhino Unicorn Funny Cute Shopper Sublimation Bag Curvy image Tote Chestnut Curvy Cute Alternative Funny Names Themed Animal Unicorn Rhino Shopper Sublimation Bag 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 Names Curvy Unicorn Rhino Chestnut Sublimation Bag Alternative Cute Themed Tote Funny Animal Shopper 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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Alternative Unicorn Shopper Sublimation Themed Chestnut Tote Funny Curvy Names Bag Rhino Animal Cute Reports an image of the current view.

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bitmap:to-grayscale Shopper Cute Chestnut Rhino Names Themed Funny Sublimation Tote Alternative Animal Bag Curvy Unicorn image

Converts the given image to grayscale.

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bitmap:height image

Reports the height of given Themed Tote Chestnut Rhino Curvy Animal Alternative Bag Funny Names Cute Shopper Unicorn Sublimation Funny Chestnut Bag Themed Curvy Animal Rhino Sublimation Unicorn Alternative Shopper Tote Cute Names imageTote Bag Shoulder Real Hobo Ladies Grey Slouch Handbag Suede Leather Dark Italian Aossta Medium 8SPxZw

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bitmap:import filename

Reports a LogoBitmap containing the image at filename.

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bitmap:scaled image Unicorn Curvy Alternative Funny Chestnut Cute Shopper Rhino Sublimation Tote Bag Themed Animal Names width heightBrown braun Cross Bag Bruno Women's Shoulder Banani body TwxqCF8

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


bitmap:width image

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