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Tag Archives: transparency
Make an image with rounded corners and a transparent background in C#
Recently I wanted to make an image for a gift card that had rounded corners. Unfortunately the Graphics class does not have a method to draw rectangles with rounded corners. Fortunately, I have already described the key method in my … Continue reading
Resize images in C#
You can use MS Paint to easily resize images. Unfortunately, it won’t preserve transparency if you save the result. I often need to resize transparent images so I finally got around to writing this example. It lets you resize images … Continue reading
Posted in drawing, graphics, image processing
Tagged C#, C# programming, drawing, example, example program, graphics, image processing, resize images, transparency, Windows Forms programming
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Make a tool that creates PNG files with transparent backgrounds in C#
When you use the File menu’s Open command, the following code lets you select a image file. // The image. private Bitmap Bm = null; // Offset for displaying the image. private const int Offset = 10; // Open a … Continue reading
Give an image a transparent background in C#
The Bitmap class’s MakeTransparent method changes all of the pixels with a given color to the transparent color A = 0, R = 0, G = 0, B = 0. When the program starts, the following code makes the background … Continue reading
Make a Region from non-transparent pixels in C#
The example Make shaped PictureBoxes in C# sets the Region property of two PictureBox controls to circular regions. That works well in that example where the images are round volleyballs with transparent backgrounds, but it would be hard to manually … Continue reading
Scale images and save them in C#
Occasionally when I’m writing a book or article, I need to scale images and then save them. MS Paint does this easily, but it loses any transparency information when it saves images. This program lets you scale images and then … Continue reading
Make a form fade out until it disappears in C#, Part 2
The example Make a form fade out until it disappears in C# makes a form fade out when the user clicks the form’s Close button, but there are several other ways the user can close the form without it fading … Continue reading
Posted in forms, user interface
Tagged C#, C# programming, close form, example, example program, fade out, FormClosing, forms, Opacity, translucent form, transparency, user interface, Windows Forms programming
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Make a form fade out until it disappears in C#
Normally when you close a form it disappears. This example shows how you can provide a different effect by making the form fade out until it vanishes. (Like a ghost or a politician’s promises after election day.) A form’s Opacity … Continue reading
Posted in forms, user interface
Tagged C#, C# programming, close form, example, example program, fade out, forms, Opacity, translucent form, transparency, user interface, Windows Forms programming
1 Comment
Remove part of an image in C#
This example lets you remove part of an image. It lets you load an image file and then click and drag to select an area on the image. When you release the mouse, the program generates two new images: an … Continue reading
Posted in algorithms, geometry, graphics, mathematics
Tagged algorithms, C#, C# programming, drawing, example, example program, geometry, graphics, image processing, images, transparency, transparent, Windows Forms programming
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