Category Archives: image processing

Crop scaled images to specific sizes in C#

Posted on June 1, 2020 by RodStephens

This example lets you crop scaled images to specific sizes in C#. The post Crop images to specific sizes in C# lets you drag a rectangle of a specified size around on an image to pick the part of the … Continue reading →

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Resize pictures in a directory to specific widths or heights in C#

Posted on April 26, 2020 by RodStephens

The post Resize pictures in a directory in C# lets you resize all of the pictures in a directory but it only scales the images. This example lets you resize pictures so they have a given width, height, or both. … Continue reading →

Posted in files, graphics, image processing | Tagged , , , , , , , , , , , , , , , | 1 Comment

Load a picture and manipulate pixels in WPF and C#

Posted on April 8, 2020 by RodStephens

The post Easily manipulate pixels in WPF and C# explains a BitmapPixelMaker class that you can use to manipulate the pixels in an image in WPF relatively easily. That example creates the image from scratch. This post extends that class … Continue reading →

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Draw an image circle in C#

Posted on February 19, 2020 by RodStephens

This example is somewhat similar to the post Draw an image spiral in C# except it draws an image circle instead of an image spiral. The key is the DrawImageCircle method, which draws a smaller image in a circle on … Continue reading →

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Use the ColorMatrix and ImageAttributes classes to quickly modify image colors in C#

Posted on February 10, 2020 by RodStephens

This example shows how to use the ColorMatrix and ImageAttribute classes to quickly modify image colors. I’ve made several posts that use those classes to modify image colors in a few specific ways. I’ve also posted other posts that modify … Continue reading →

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Rotate images to straighten them in C#

Posted on January 27, 2020 by RodStephens

I’ve written a couple of examples that show how to rotate images. I made many of them because I wanted to adjust a picture I had taken that was slightly crooked. Those examples work well, but they can be fairly … Continue reading →

Posted in algorithms, graphics, image processing, transformations | Tagged , , , , , , , , , | 1 Comment

Make a hexagonal montage of pictures in C#

Posted on January 23, 2020 by RodStephens

This example combines techniques from several earlier posts to make a hexagonal montage. It uses the techniques demonstrated in the post Draw a hexagonal grid in C# to define the grid and to make positions on the form two and … Continue reading →

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Clip an image to a polygon in C#

Posted on January 16, 2020 by RodStephens

This example lets you select a polygon and then uses it to clip an image to it. It uses the technique described in my previous post Build a polygon selector class in C# to let you select the polygon. The … Continue reading →

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Arrange images on the corners of a polygon in C#

Posted on January 5, 2020 by RodStephens

This post shows a way to arrange images on top of a background image as shown in the image above. How to Use the Program Enter the names of the background and foreground image files, or use the File menu’s … Continue reading →

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Make an improved diagonal picture montage in C#

Posted on December 26, 2019 by RodStephens

My earlier example Make a Pinterest-style diagonal picture montage in C# showed how you could make a picture montage showing parts of images rotated by a desired angle. While using that program today I found a small bug. The areas … Continue reading →

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