Tag Archives: transparency

Make a tool that creates PNG files with transparent backgrounds in C#

Posted on January 4, 2017 by Rod Stephens

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 →

Posted in graphics, image processing | Tagged C#, C# programming, example, example program, graphics, image processing, MakeTransparent, png, transparency, transparent, transparent background, transparent bitmap, transparent image, Windows Forms programming | Leave a comment

Give an image a transparent background in C#

Posted on January 3, 2017 by Rod Stephens

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 →

Posted in graphics, image processing | Tagged C#, C# programming, example, example program, graphics, image processing, MakeTransparent, transparency, transparent, transparent background, transparent bitmap, transparent image, Windows Forms programming | Leave a comment

Make a Region from non-transparent pixels in C#

Posted on September 2, 2016 by Rod Stephens

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 →

Posted in algorithms, geometry, graphics, image processing | Tagged algorithms, C#, C# programming, example, example program, geometry, graphics, image processing, pixels, regions, transparency, transparent, transparent pixels, Windows Forms programming | Leave a comment

Scale images and save them in C#

Posted on August 29, 2016 by RodStephens

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 →

Posted in drawing, graphics, image processing | Tagged C#, C# programming, drawing, example, example program, graphics, HighQualityBilinear, image processing, InterpolationMode, resize images, scale images, transparency, Windows Forms programming | 1 Comment

Make a form fade out until it disappears in C#, Part 2

Posted on November 3, 2015 by RodStephens

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 | Leave a comment

Make a form fade out until it disappears in C#

Posted on November 3, 2015 by Rod Stephens

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#

Posted on April 25, 2015 by Rod Stephens

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 →