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Using images

From: Interactive Data Visualization with Processing

Video: Using images

Processing allows you to integrate images that have already have been created as, for instance, JPEG or PNG files, in addition to drawing your own shapes. What I want to show you this is two different ways to work with images. The first is how to integrate an existing file that you have on your own hard drive, a local file, and also how to use a web-based file with just a link. So I'm going to start by putting the title of this one as a comment, with a 600 x 200 pixel window, and then what I'm going to do is I'm going to load an image from the hard drive.

Using images

Processing allows you to integrate images that have already have been created as, for instance, JPEG or PNG files, in addition to drawing your own shapes. What I want to show you this is two different ways to work with images. The first is how to integrate an existing file that you have on your own hard drive, a local file, and also how to use a web-based file with just a link. So I'm going to start by putting the title of this one as a comment, with a 600 x 200 pixel window, and then what I'm going to do is I'm going to load an image from the hard drive.

Now, I have an image that's available in the Exercise folder. I am going to move this over for just a moment and there you see, I have a spaceinvader picture. Now what I can do is a just grab that and drop it onto here. Now you don't get to see it, but you can see down the bottom it says One file added to the sketch. And if we go to the Sketch here, I now have a data folder, and there's a picture in the data folder. I'll maximize this again. So now I've made that file available to the sketch. What I do is I am going to be using a PImage variable.

That's actually an object, but this is a PImage that's for Processing image. And I am going to just call it spaceInvader. And then what I have to do is I need to load that file into the variable, so I type spaceInvader, because in the last line l just declared it; I didn't initialize it. This is basically initializing. And then I'll use the function loadImage. And then what I need to do is I need to put the name of the image, complete with its extension, in quotes. So I'm going to come into space, and again, you have to get the capitalization exactly how it was in the original.

This one is .jpg. Make sure this not .jpeg, because then it's not literally on the dot. Put that in quotes, put in parentheses, and finish with a semicolon. And so what that does is it loads the image into the variable, so it's basically initializing the variable. And then what I can do is I can place the variable. I use the image function, and I go by the name of the variable that I created, spaceInvader. I am not using the name of the file. And then I put the x and y for it. This is going to be based on the top-left corner.

So for this one, I'll just put it as 00. Now, I should mention that this file is already appropriately sized to be 300 pixels wide and 200 pixels tall. If your file is a different shape or a different size, you have the option of resizing it. And so let me show you what this like if I just press Run. There you go. Now, my spaceInvader, I have already got it on the left half because I'm going to put something else on the right half. It's appropriately sized. If it were a different size, I could change that by adding a fourth and fifth argument to this file right here.

Say I wanted to make it 200 pixels wide and 150 tall. I can do it that way, and it will resize it. It might get distorted in the process, but that's something that Processing is able to do. But mine is appropriately sized already, which is handy, so I'll leave it right like that. Now I want to show you how you can use not just a local file, but you can also use files straight off of the web without first loading them on. This is handy in particular if you're going to be using Processing to build a web page, as long as this is going to be one where you know that image is going to be there for least a little while.

In this case, I just need to declare another key PImage variable. I'm going to call is one of webInvader. And then I have a String here, a string variable that's going to have the URL. I'm actually calling the string URL. You can call whatever you want; you can call it you know webInvader location on the web or whatever. And then we're going to put in quotes the complete URL for just the image. Now I am going to show you, I have the image open on the web here. This is one I got from Creative Commons off of Flickr, so this one is okay to use.

I highlight the entire address and go back to where I was, and I can paste it in. Its long, but that's the whole thing. And then I finish with a semicolon, so that's the URL for the image. Then what I can do is I load that image into the variable. So I go webInvader=loadImage, just like I did up above, except this time all I have do is put URL. And then I can place it the same way I did earlier, image. This was called webInvader. And I am going to move it over to the side.

I am going to move it over 300 pixels and keep it at the top. Now, let me show you, this one actually is a different size. So when I press Run, you see it's actually too big over here, and that's where I can do the manual resizing. What I am going to do right here is tell it that I wanted to be 300 pixels wide and 200 pixels tall. Save that and now they show up side by side. Now, you should know that Processing actually has a lot of functions that allow you not only to place the images, but it allows you to modify them. I am going to show you just two of them really fast, and I am going to let you explore the others.

First one I'll put up here, and I am going to use a filter, and filters give you a lot of different options. I am just going to do one that is kind of fun, and that is I am going to blur it. And when I do that, it's counterintuitive. You put the command after the image, because what it's doing, is it is like superimposing the filter on top of the image. And so because things go in the order on which they are drawn, the filter needs to come after the thing you want it to be on. So now when I draw it, the spaceInvader on the left is blurred, but the one on the right is not, because the filter came before it.

Now I can come down to the bottom, and I am going to put on another filter and because this one is at the bottom, it will affect both of the images. This one, I am going to do a GRAY. And what it's going to do is going to turn both of them into grayscale images. Now, there are a lot of other options here. You can posterize. You can invert the images. There is a ton of stuff you can do. And you can also in fact save the images in their new format. We will cover that in a later movie. But for right now, this gives you an idea of how you can do some work with images in Processing.

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This video is part of

Image for Interactive Data Visualization with Processing
Interactive Data Visualization with Processing

72 video lessons · 12132 viewers

Barton Poulson
Author

 
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  1. 3m 16s
    1. Welcome
      58s
    2. What you should know
      1m 22s
    3. Using the exercise files
      56s
  2. 11m 51s
    1. Overview of data visualization
      11m 51s
  3. 11m 53s
    1. Installing Processing
      3m 38s
    2. Overview of Processing
      4m 5s
    3. Exploring libraries
      4m 10s
  4. 1h 1m
    1. Basic setup
      7m 31s
    2. Drawing points
      4m 37s
    3. Drawing lines
      5m 6s
    4. Drawing ellipses and circles
      5m 24s
    5. Drawing arcs
      6m 54s
    6. Drawing rectangles and squares
      4m 58s
    7. Drawing quadrangles
      3m 25s
    8. Drawing triangles
      2m 55s
    9. Drawing polygons
      3m 37s
    10. Drawing simple curves
      4m 54s
    11. Drawing complex curves
      6m 46s
    12. Drawing Bézier curves
      5m 38s
  5. 54m 3s
    1. Introduction to variables
      10m 44s
    2. Understanding variable scope
      6m 53s
    3. Modifying variables
      9m 8s
    4. Creating arrays
      9m 53s
    5. Modifying arrays
      6m 37s
    6. Creating strings
      7m 3s
    7. Modifying strings
      3m 45s
  6. 1h 2m
    1. Incorporating randomness
      7m 59s
    2. Using Perlin noise
      4m 24s
    3. Shuffling with Java
      3m 30s
    4. Specifying line attributes
      8m 2s
    5. Changing placement modes
      5m 45s
    6. Understanding color attributes and functions
      4m 16s
    7. Exploring color spaces
      7m 44s
    8. Using color palettes
      7m 5s
    9. Transforming the grid
      8m 38s
    10. Exploring the attribute matrix
      5m 33s
  7. 52m 7s
    1. Building code blocks
      5m 57s
    2. Writing a while loop
      3m 52s
    3. Using for loops
      5m 35s
    4. Creating conditionals
      14m 50s
    5. Working with easing
      10m 51s
    6. Creating spirals
      11m 2s
  8. 18m 55s
    1. Mouse tracking
      3m 54s
    2. Hovering and clicking
      11m 16s
    3. Understanding keyboard interaction
      3m 45s
  9. 27m 32s
    1. Specifying fonts
      6m 43s
    2. Using images
      5m 51s
    3. Playing a video loop
      6m 20s
    4. Exporting video
      3m 47s
    5. Adding sound
      4m 51s
  10. 20m 49s
    1. Creating functions
      11m 48s
    2. Creating classes and objects
      9m 1s
  11. 31m 10s
    1. Using embedded data
      5m 26s
    2. Working with appended text data
      6m 4s
    3. Working with appended tabular data
      10m 26s
    4. Reading XML data
      9m 14s
  12. 48m 17s
    1. Generating dot plots
      11m 11s
    2. Building scatter plots
      10m 0s
    3. Making line plots
      9m 55s
    4. Creating bar charts
      9m 12s
    5. Checking out examples of maps, hierarchies, and networks
      7m 59s
  13. 20m 57s
    1. Introducing some principles of 2D design
      13m 44s
    2. Understanding color theory
      7m 13s
  14. 24m 46s
    1. Interacting with zooming, rotating, and sliding
      6m 26s
    2. Implementing slicing
      6m 47s
    3. Using rollovers
      5m 58s
    4. Introducing the GUI libraries
      5m 35s
  15. 10m 35s
    1. Sharing via OpenProcessing and other sites
      3m 19s
    2. Saving as a desktop application
      2m 42s
    3. Saving as JavaScript
      1m 47s
    4. Saving as an Android application
      2m 47s
  16. 2m 38s
    1. Where to go from here
      2m 38s

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