16 votes

How do I convert a .png blurred background into a compressed .jpg one without introducing artefacts?

This probably doesn't answer your question. Some possible alternatives... Have you considered CSS instead: background: linear-gradient(45deg, #3d667c, #1d283e); Or perhaps you could use the SVG ...
  • 306
14 votes

How to crop a JPG without recompressing?

Lossless cropping of a JPEG image is possible using the "jpegtran" application that comes with libjpeg; see https://en.wikipedia.org/wiki/Libjpeg. Quoting from "man jpegtran" on a system where ...
13 votes
Accepted

How do I convert a .png blurred background into a compressed .jpg one without introducing artefacts?

JPEG is not a lossless compression JPEG Compression is considered a lossy compression even when set at 100% quality you loss some quality. That's why for simple graphics such as UI interfaces and ...
13 votes
Accepted

Photoshop: how to reduce the size of a PNG for web use

The geeky details (you did not ask for) Some image formats, such as JPG, support Lossy Compression. When a Lossy Compressed image is saved and then rendered back, the image is not 100% exactly as you ...
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11 votes
Accepted

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

Although the question was asked about Adobe Photoshop, the behavior is due to the lossy JPEG format and would be similar with any image editor. Cropping a JPEG can make it less compressible, ...
7 votes
Accepted

How to crop a JPG without recompressing?

FreeVImager can do this with nice GUI. It also can do lossless rotation of JPEGs (90 deg rotations are loseless). It's FOSS, so if you're on Linux, it's worth getting Wine for one.
7 votes
Accepted

Inkscape: how to compress image in SVG?

An SVG with an embeded image will always be bigger as the SVG (without embeded raster image) and the original raster image together, because SVG files are text files and have to encode the embeded ...
  • 1,805
6 votes
Accepted

Reduce 30MB image to less than 50KB without significant loss

A ~620% file size reduction is asking a great deal. It's possible, but I'm not sure what restrictions should be watched, file dimensions? color depth? etc. ^^50k gif file. This is a reduction of ...
  • 200k
6 votes

Why is my PDF size from my InDesign Export still large?

There is so many methods that reduce your PDF make sure you follow one of it or you may need "in some cases" to follow all of them. some when you export from indesign and some in Acrobat itself as a ...
  • 5,349
5 votes
Accepted

Can Animated GIFs be reduced in filesize by comparing regions that actually changed?

I'm guessing this is the case actually, no, that's not the case. Animated GIFs are optimized in exactly this way...each frame only contains the parts of the image that actually changed from the ...
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5 votes

How to crop a JPG without recompressing?

Irfanview has lossless JPG cropping and rotation functions:
  • 151
4 votes

Transparent png shadows are filled

Blending modes do not translate to PNG images. I would guess that you've se the shadow to Multiply within Photoshop. Your shadows need to be set to Normal for the blending mode. This may mean you ...
  • 200k
4 votes

Large web background image - how to split into JPG and PNG part

Is that a good idea, in theory? Sure. If yes, is there a program or algorithm that can do the image split and the compression with the following goals: I don't now that you need that. I'd build ...
  • 49.9k
4 votes
Accepted

Compress png images with Gimp

GIMP is quite good in PNG compression, but not the best. To get a basic idea about PNG optimization, read File size and optimization software chapter in "Portable Network Graphics" article on ...
4 votes

Is there any method to deliberately digitally corrupt an image?

I guess there are many ways to do this. The effects user120647 posted look like some kind of high compression artifacts, like when an MPG video lose the keyframes. But I guess you can, for example, ...
  • 34.2k
4 votes

Is there any method to deliberately digitally corrupt an image?

You can corrupt/glitch an image yourself. All you need is a text editor. Open the image in a text editor, such as Notepad++ Scroll down the code a bit to get away from the header code, and copy a few ...
3 votes
Accepted

From jpg to png with similar size

Since you seem to be talking more generally about any image rather than a specific image, the answer is generally no. The PNG and JPG formats work very differently and each is more appropriate for ...
  • 40k
3 votes
Accepted

Why does enabling transparency in an animated gif reduce its file size?

Got some free time and decided to skim through the GIF Specification. For a layman (i.e. me) it's pretty dense. That said, I think I've found what makes the optimization possible. For context, under ...
  • 161
3 votes
Accepted

File size dilemma in Photoshop for print-quality large banner

The original file wasn't pixel-based but vector. Pdfs can contain all kinds of data, not just pixel images. When you open a .pdf in Photoshop, you force the program to rasterise it into a pixel image....
  • 24.5k
3 votes

Instagram blurrying my designed posts

You literally need to deal with it, as it is, and there's some guidance on this, here: https://www.adobe.com/express/discover/sizes/instagram. Instagram and pretty much every social media app, will ...
  • 27.7k
3 votes
Accepted

Inkscape SVG becomes very large compared to PDF

I can get the SVG down to 26.5kb if that's any help, without having to resort to using any compressed format. Here's how I did it. Open the PDF in Inkscape, select everything and ungroup everything ...
2 votes

Why do JPEG files blur red more than other colors?

Take a look at YCbCr luma component: See, it is not about red color (nor blue and green color). It is about the sharp-edges that are visible in YCbCr luma component. Let's change colors from RGB ...
2 votes
Accepted

Will I lose image quality when editing and re-saving an existing png file?

While being compressed a png image still is lossless. If you change parts of your image and re-save the quality of the image is still the same! Sources: long personal experience german Wikipedia-...
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2 votes

How do I compress/zip files in Bridge?

No, you're not missing something. The OS (Mac or Windows) can create zip files on the fly, so I guess it's never been something the Bridge team felt it would be redundant to add that to Bridge.
2 votes

Can Animated GIFs be reduced in filesize by comparing regions that actually changed?

Yes, GIF files can be optimized in that way. This reduces the size of the individual frames, and thus the overall file size. Your image manipulation application might offer this; for example the ...
2 votes

How to remove black pixel bleed? (Illustrator CC or Sketch)

I wouldn't be concerned about this. You seem to be zoomed in quite far too. Also I'm pretty sure this is an artifact of raster anti-aliasing. If the "black line" or blend wasn't there, you would have ...
  • 1,521
2 votes

Photoshop: how to reduce the size of a PNG for web use

Try adding a Posterize adjustment layer to the image and reduce the number of colors. I find you can still retain high quality and reduce the file size through this method.
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