![]() PNG format images can have transparent background. Changing Background Color of a Transparent PNG Image The below provided code snippet demonstrates how to apply filter method on PNG image. It accepts PngFilterType enumeration that can be used to specify the filter method (algorithm) among the five including 0 for none. NET API has exposed a property named FilterType of PngOptions class. For this purposes, the Aspose.Imaging for Python via. NET API can be used to apply filter methods before compressing any PNG image. The purpose of these filter methods is to prepare the image data for optimum compression. NET provides the functionality to apply filter methods (algorithms) before compression as demonstrated in the below section. Applying Filter Methods on PNG ImagesĪspose.Imaging for Python via. The below provided code snippet demonstrates how to set the Bit Depth of an existing PNG. For all other color types only 8 bits are supported. At the moment, the BitDepth property can be set to 1, 2, 4 or 8 bits for grayscale and indexed color types. NET API can be used to set bit depth for PNG images using BitDepth property exposed by the PngOptions class. Like all other bitmap formats, PNG color depth is also represented in bit such as 1-bit (2 colors), 2-bit (4 colors), 4-bit (16 colors) and 8-bit (256 colors). Specifying Bit Depth for PNG Imagesīit depth in imaging is the number of bits used to indicate the color of a single pixel in a bitmap image. The below provided code snippet demonstrates how to set the Compression Levels using Aspose.Imaging for Python via. This property accepts a value from 0 to 9 where 9 is the maximum compression. Aspose.Imaging APIs can be used to set the Compression Levels for the PNG file format using the PngOptions class that has an int type CompressionLevel property. This article describes how Aspose.Imaging APIs allows you to control the PNG file size. Setting this value actually compresses the file size and does not decrease the image quality. When you save an image as a PNG file in any program, you may be asked to choose a compression level in a range from 0 to any max level. The Portable Network Graphic (PNG) is a lossless compression format for transmitting a bitmap over networks. The code snippet below loads an existing BMP image and converts it to PNG format also changing the resolution. NET API to set the horizontal & vertical resolution parameters for the PNG image format. This article demonstrates the usage of the Aspose.Imaging for Python via. NET 2.5.0, the API exposes the ResolutionSetting class which can be used to set the resolution for all image formats including PNG. The below provided code snippet demonstrates how to convert an existing BMP image to PNG format by creating a PNG image from scratch while specifying the desired color as transparent. NET API has exposed TransparentColor property and PngColorType enumeration that can be set to specify any color to be rendered as transparent in the newly created PNG image. NET API can be used to set any color as transparent while creating new PNG images or converting existing images to PNG format. NET provides the feature for specifying transparency for the PngImage & RasterImage classes as demonstrated in the below section. One of the advantages of saving images in PNG format is that PNG can have transparent background. Changing Background Color of a Transparent PNG Image.The code he posted is in C#, so i dont know if this will help or not, but here ya go anyway. Utilizing the TransparencyKey property of a form is far less efficient than using GDI+Īlthough this sounds rather complicated, a quick analysis of the three lines of code should prove otherwise: Using the three points in the code, the window should appear triangular, and by setting the form's FormBorderStyle property to none, the title bar of the application won't appear. You'll need to supply further coordinates in order to create a more advanced border. The region property is set to a new region with myGraphicsPath in the constructor. In using the GraphicsPath AddPolygon method we supply several PointF coordinate arguments to initialize myGraphicsPath Using the GraphicsPath object, we're able to coordinate the outline for the form border. The following is a description of the code which can be downloaded below:
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