In this article, you'll learn how to write a Pixel Bender kernel that combines multiple pixels from the same image. If you've been following along with the instructions provided since the beginning of this series, you've been building on the same file with each subsequent section. This time, we're going to start by creating a brand new filter, using the steps provided in the first article in this series.
This is the fourth installment in this series of articles about using the Pixel Bender Toolkit to create visual effects with bitmap images. In the previous section, you learned how to add parameters to create a slider interface that affects the display of the image in the preview window. You also learned how to add metadata to the parameters to ensure consistency when the effects are displayed. In this section, you'll learn how to sample multiple pixels from the same input image.
Setting up the files
If you'd like to follow along by reviewing the code in the working copy, download the sample files provided. To get started, follow these steps:
- Choose File > New Kernel to create a new filter.
- Load the YellowFlowers.png image and modify the kernel metadata as described in the first article in this series.
- Click the Run button to run the filter.
- After verifying that there are no syntax errors, choose File > Save Filter.
- Name the file Exercise4.pbk and save it in the folder named pixel_bender on your desktop.
Adding a float parameter
In this part, you'll update the code using the syntax you learned in Part 3 of this article series. Follow these steps:
- Find this line of code:
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