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Why are JPG images lighter than PNG images?

JPG (Joint Photographic Experts Group) and PNG (Portable Network Graphics) are two popular image file formats, and there are some fundamental differences between the two which explain why JPG images are lighter than PNG images.

JPG images are compressed using a lossy compression method that discards some of the information from the original image. This compression method works well for photographic images, as it can reduce the file size significantly while still maintaining a visually acceptable level of image quality. However, the degree of compression can be adjusted, and higher levels of compression will result in lower image quality, including visible artifacts like compression artifacts, noise, and blurring.

On the other hand, PNG images use lossless compression, which means that they maintain all the original data and do not discard any information. This results in higher-quality images, but the file sizes are typically larger than those of JPG images. The compression algorithm used in PNG images is called DEFLATE, which is a variant of the Lempel-Ziv-Welch (LZW) compression algorithm. PNG images also allow for transparency and alpha channels, which can add to the file size.

Another factor that contributes to the lighter file size of JPG images is the color depth. Most JPG images use 8 bits per color channel, which means that there are 256 possible color values for each red, green, and blue channel. In contrast, PNG images can use 8, 16, or 24 bits per color channel, which means that they can represent a much larger range of colors. The increased color depth of PNG images means that they can be used in applications that require higher color accuracy, such as graphic design or scientific imaging, but they also result in larger file sizes.

If you have a PNG image but you need to convert it to JPG format to make it lighter, you can use our image resizing tool, selecting 100% size to keep the original size, and selecting JPG as the output format. You will also be able to select a quality percentage which determines the quality but also the file size of the resized image.

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