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The way that JPG compression works means that sharp edges become blurred with artefacts introduced in the compression process. As Philip Greenspun so aptly pointed out , readers can’t tell when an image is “done”. IrfanView has a range of settings for saving JPG images from best to 1 lowest. JPEG is lossy, so as file sizes decrease, more and more of the image is lost. April Learn how and when to remove this template message.
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That’s an offer I can’t refuse. The trick here is that these images are already optimized; I run OptiPNG on every file in this folder pngouut. Photographs of landscapes and people are usually quite acceptable at a save quality of 50 or even lower.
Using higher settings than 75 gives ever diminishing improvements in quality for rapid increases in file size see the chart below. Views Read Edit View history.
The way that JPG compression works means that sharp edges become blurred with artefacts introduced in the compression process. Just be aware that for some images with large areas of the same colour, or with text or sharp lines, either PNG or GIF will prove much better. Mouse-over the image to compare the default version saved at a quality setting of 50 8, byteswith one saved at a quality setting of 75 13, bytes.
You want an animated graphic. Using a moderately high setting of 75 it looks almost as good as the original PNG image.
You might notice a loss of colour quality on some screen shots, but often a PNG image can be reduced to colours to reduce the file size a bit more. If you want to provide a high quality image for your site visitors do it by providing a link to one.
If you have interlaced PNG images, you can expect a very substantial reduction in file size. The same dialogue box saved as GIF pgout can be seen on pngot the mouse down is 37, bytes. No wonder his little PNG optimizer decimates all the other ones.
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The quality remains reasonable all the way down to a save quality of 25 for most images. I took a quick screenshot of this website, along with all the browser chrome, transparency, and shadows. However, with this image, the difference is just about noticeable on mouse-over or mouse down. This PNG image is irfanvieq pixels.
For a more thorough explanation take a look at Digital Image File Types. This sunset seascape image started life as a high quality image from the Premium Image collection. The image has been resampled to one eighth of the original dimensions using the best Lanczos filter to make it a suitable size for this web page. This one-time optimization could reduce your image bandwidth usage from 10 to 30 percent.
;ngout Can you tell the difference? IrfanView estimates that it was saved with a save quality of Your image is extremely small, on the order of a few hundred bytes. You can help Wikipedia by expanding it. To get the same file size reduction as for the first image, one would need to use a save quality of 15 and accept very low quality.
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Also remember to strip EXIF data as this adds a lot of bytes to small images. The best quality is always the original image.
Wherever you want to show an image at its very best without making your site too heavy for those on slow connections or expensive for those who pay for bandwidth, irdanview can try a slightly higher save quality than the one that you use for other images. Cameras will save images at a high quality, which can only degrade with repeated saving and compression. Dialogue boxes and screen shots of software interfaces are ideally suited to saving in PNG pngoutt.
This page was last edited on 30 Januaryat