tga转换jpeg
在线计算网 · 收录于 2022-08-08 11:58:44
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文件扩展名.tga
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文件类别images
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程序Adobe PhotoshopCorel Paint Shop ProGIMPPainter
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说明TGA是通常被称为TARGA和是一个位图图形文件格式。它是独创而TrueVision Incorporated的，它最初是为他们的显卡创建于1984年，但特别是在领域，如视频编辑和动画的创作得到了普及在不同的平台上使用。每像素1-32位颜色定义此文件格式的支持。其它支持的颜色深度包括α-通道和压缩RLE。
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技术细节所存储的图像的范围从8至32位。 32比特图像是透明的24位颜色深度。那可用于图像颜色定义使用的调色板。 TGA图像包括的主要是大尺寸的文件，因为在像素的表示中使用的比特的数量。这依赖于颜色的深浅，这就是为什么在这种格式的文件尺寸较大。此类文件的压缩可以通过编码的过程中完成，这最终将导致减小文件大小。
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MIME类型image/x-targaimage/tiff-fx
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文件扩展名.jpeg
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文件类别images
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程序Adobe PhotoshopApple PreviewCorel Paint Shop Pro
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主程序MS Paint
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说明JPEG – is a popular graphic format, which is characterized by a high degree of compression, which leads to a decrease in image quality. It uses the technology of encoding of smooth color renditions, providing the ability to reduce the amount of data frequently during the recording of the image.
Because of the small size it is requested by the owners of websites, allowing you to save the traffic effectively. It is also frequently used in memory cards of digital video cameras. The JPEG algorithm is optimally suitable for compressing photographs and pictures, in which realistic scenes with little contrast of colors are present. It is not recommended to use this format for compression of drawings and various kinds of graphics, since a strong contrast between a number of closely located pixels provokes the appearance of visible artifacts.
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技术细节The procedure for compressing the digital images in JPEG format is carried out in several stages. First, the photo is transformed into a color space YCbCr, then it is divided into squares to determine the upper range of the color spectrum. Finally, the colors and brightness are coded.
JPEG uses a "lossy" compression system and discrete cosine transform technology. The format acts simultaneously as the standard of ISO and the International Telecommunication Union. The file compression ratio is in the range from 10:1 to 100:1. In this case, the reduction in image quality can vary from insignificant to substantial.
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MIME类型image/jpeg
