Questions about the JPEG (`/ˈdʒeɪpɛɡ/ jay-peg`) file format. JPEG, seen most often with the `.jpg` extension, is a commonly used method of lossy compression for digital photography.

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18
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9answers
98k views

Facebook: Ways to preserve image quality of uploaded images?

After uploading an image, Facebook converts it to a new image. Their conversion process introduces artifacts and mottling to the magenta-ish parts of the image. Original image: Facebook's ...
3
votes
1answer
217 views

When resaving JPEGs, the file size increases, but the quality is not changed – why?

I was experimenting with JPEG quality loss upon resaving and noticed that not only (even after four resaves) did the quality not degrade (down to pixel level), but the file sizes actually increased by ...
2
votes
4answers
3k views

How can we talk about the “resolution” of a JPEG file?

A JPEG is characterised with three parameters: width (pixel), height (pixel) and bit depth (bits per pixel). And resolution is a characteristic for output devices, e.g., monitors or printers. Why? ...
0
votes
1answer
96 views

What is the easiest way to have a better quality image from a given image

I am a novice for graphic design. I have a low quality image which is given by my friend, its size is really small, but we want to make it bigger and clearer so that we can use it as a banner or logo ...
0
votes
3answers
10k views

Create jpg image with good quality

I'm trying to save a jpg image but it's getting a bit blurred. I have it nicely in my image editor, but saving the image is not giving the quality I need, even with max quality defined. If I save it ...
2
votes
1answer
1k views

Why does a JPEGs file size increase after cropping and saving for web in Photoshop?

When I save my image for the web in Adobe Photoshop, the produced jpeg is larger than the original jpeg file. The only alteration done to the image is cropping. How is this possible? I am saving the ...
1
vote
1answer
1k views

Why does my compressed JPG have different colors from the original file?

I have no idea at all, first of all, of image internal composition and color modes. That said, I have a very strange problem. These are the pictures: Well, the ORIGINAL is more colorful in ...
1
vote
4answers
23k views

Resizing/shrinking .JPG files without losing quality?

Im using Gimp to resize images. When using a high res image normally 4500 x 2994 i usually need to shrink this image to 325 x 130 pixels. As you can imagine i loose the shiny, glossy and high res ...
1
vote
4answers
8k views

how to import a mathematical equation in Corel Draw X5

I have a problem I could not solve. I am doing a poster in Corel Draw X5, and as it is a physics poster, I need to put mathematical equations in it. The Corel built in text editor is just completely ...
0
votes
4answers
262 views

Which raster image format is better for digitally displaying images when there is no transparency; JPEG or PNG?

I'm trying to determine which format is better to use when there is no transparency in an image. More importantly though, I'm trying to figure out when it's better to use one over the other. From ...