Questions tagged [jpg]

Questions about the JPEG file format. JPEG is a commonly used method of lossy compression for digital photography.

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27 votes
9 answers
118k 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 ...
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  • 387
25 votes
4 answers
13k views

How to crop a JPG without recompressing?

Is it possible to crop a JPG image without losing quality/recompressing the remaining part of the image?
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17 votes
3 answers
8k views

Why do people use JPG images?

I see JPG images everywhere. But why? PNG files have opacity, while JPGs do not. I've tried exporting some images to PNG and JPG to compare size, and they both either match up or the PNG is smaller(...
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7 votes
5 answers
5k views

Is there any method to deliberately digitally corrupt an image?

For an art project. I want to take a high-resolution digital image and digitally 'corrode' it. My original intention was to subject an image to repeated jpg compression, and show the iterations, but ...
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4 votes
1 answer
8k 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 ...
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  • 143
3 votes
6 answers
61k views

"placed" Photoshop images in Illustrator - blurry when saved as .pdf?

I've edited some images in Photoshop to be used in a .pdf I'm creating in Illustrator. In PS, the images looked great and were saved with the following settings: .jpg/CMYK/Image Options: 10/Maximum. I ...
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  • 257
3 votes
2 answers
22k views

Photoshop shortcut for File, Save As, Format: PNG or JPG, Save, OK [duplicate]

Classical situation: you're working in Photoshop on a PSD file and you want a to export it to PNG or JPG. Here is the usual way: menu File > Save As > Click on Format > Find PNG in the list and ...
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  • 481
3 votes
1 answer
2k 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 ...
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  • 31
1 vote
2 answers
737 views

Convert .JPG to Vector

Is there a way to convert a .JPG image in to vector format? I'm using Illustrator and I've tried that "Image Trace" but the result doesn't look any where close to my original. Plus, I cannot select ...
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  • 347
0 votes
1 answer
256 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 ...
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  • 113
3 votes
2 answers
390 views

Need to improve the quality of images with GIMP

I have a number of jpg images whose quality I would like to improve. It is planned to both print them and use them in digital format. I guess to use the GIMP or another programm that I can install in ...
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  • 33
2 votes
1 answer
14k views

Why does resizing a jpeg from bigger to smaller make it blurry?

I am resizing an image from 3000x810 to something smaller 900x243 but this makes the image blurry. I am curious why this is happening. I understand why making an image larger results in a blurry/...
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8 votes
5 answers
78k views

Save a JPG without a background

I have created this image in Photoshop: Layers: I would like to save this arrow to a .jpg file without the white background rectangle. How can I achieve that? I was trying to hide the background ...
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  • 413
5 votes
2 answers
10k views

Clipping mask retained in jpg file

I have a JPG which appears to of retained a clipping mask: (http://gdh.guildmembers.co.uk/logos/LEVENE%20MAG.jpg) When this file is opened in photoshop / fireworks and then the "Paths" tab is ...
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  • 153
3 votes
4 answers
20k 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? ...
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2 votes
4 answers
17k 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 ...
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  • 121
1 vote
5 answers
28k 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 ...
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1 vote
4 answers
611 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 ...
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  • 8,308
1 vote
2 answers
2k views

Blurry distortion after uploading images to Facebook

Can anyone tell me what is causing the discoloration around the black areas in the red field in this image and how to correct it? It's not showing up in the source file JPG or PNG in the program but ...
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