Chapter 15, Images …a few points

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Presentation transcript:

Chapter 15, Images …a few points

Getting Started PImage is a class for loading and displaying an image. 4 steps to draw an image to the screen. Add file to data folder Create the PImage variable Load the image into the variable with loadImage() Draw the image image() function

Activity Practice Example 15-1. Use image of your own. To get the image: Drag file into Processing window, or Click SKETCH>Add file, or Create the data folder and add file manually. Practice Example 15-1. Use image of your own. Next, control the height & width with the mouse. Other considerations The files accepted are GIF, JPG, PNG & TGA Spaces are OK, but the file name is case sensitive.

Resizing an Image Problem: Using a 4th & 5th parameter to resize an image does not work consistently. e.g. image(img, 0, 0, width/2, height/2) Solution: There is a consistency issue with how images are rendered when sized that way. Ideally, should resize in image editor. A workaround is to calculate by using image dimensions. e.g. image(img, 0, 0, 240/2, 190/2) The proper function is with resize(). https://processing.org/reference/PImage_resize_.html

Animate Use translate and rotate to animate an image Increment or decrement. Remember that rotate is measured in radians Change mode if desired: rectMode(CENTER)

Another Practice Exercise Open your Example 15-2 and let’s examine code. Use your own picture from www.pngimg.com or www.freepngimg.com For a remix, add JPG picture as background() Use a for() loop to repeat a PNG picture across width of the screen.

All About Tinting Tint is similar to fill(), setting the color and alpha transparency. Functions are tint() and noTint() Example: tint(0, 255, 0, 127) will give green tint with 50% opacity You can also use hexadecimal colors, e.g. tint(#FF0000, 50) will be a red tint, with near complete transparency.

Syntax of Tint and Alpha About Alpha Alpha is from 0-255, where: 0 is completely transparent 255 is completely opaque 3 values: tint(r, g, b) 4 values: tint(r, g, b, alpha) 1 values: tint(brightness) 2 values: tint(brightness, alpha) Tint

First Example Original tint(255, 100); That is… Shows rainbow row behind waterfront pineapple. That is… white for NO color change, and 100 for partial transparency

Another Example: tint(255, 0, 0); Or tint(#FF0000); Shows a red tint with no transparency

Another Example: background(0); tint(0,200,255 ); background(0); …blue/green with no transparency background(0); tint(0,200,255,50); …blue/green with high transparency against black background.