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Questions tagged [compression]

Questions about reducing a file's size by automated pattern recognition, and the resulting changes in image quality.

2
votes
2answers
29 views

Does the GIF file format remove shared data between frames?

I'm looking into various file formats and how they are optimized for their main purposes, but I've found that the GIF file format uses lossless compression meaning it would have a higher file size ...
1
vote
3answers
99 views

How to fix horizontal lines from JPG compression in an image?

I have a geometric wallpaper that I downloaded for my phone, but it has these horizontal lines in it, from what a presume is an artifact of JPG compression. Any thoughts on how to fix?
2
votes
0answers
34 views

PDF export in Illustrator: Control which images to compress

I have several Illustrator files that have multiple embedded bitmap images. Some are photos and some are detailed line art. When exporting to PDF, it is possible to control downsampling and ...
0
votes
0answers
26 views

Why does PNG perform so poorely on mirror image redundancy?

PNG, and the deflate compression it uses, is usually pretty good at exploting redundancy. For example, this 18.1kB image only grows to 19.1kB when duplicated and concatenated: ---> By Contrast, it ...
1
vote
1answer
21 views

Adobe Illustrator formating to JPG turing out stretchy @ [closed]

I have finished some work on Adobe Illustrator, converted it to PDF and then JPG. but no matter how many times I changed the settings with compression, My art board looks all squished...anybody know ...
2
votes
0answers
65 views

A best way to compress a png atlas with transparency

I have an atlas of assets in a transparent png with 8-bit alpha (660kb) and I want to compress it. Could you suggest what options do I have? When using a pngquant (I'm using SuperPNG plugin for ...
4
votes
2answers
162 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 ...
1
vote
2answers
337 views

File size dilemma in Photoshop for print-quality large banner

I'm an intern at a marketing department and got an assignment to update a banner with new information, and was directed to a pdf file to edit. It was only 3MB, which seemed very low for a large print-...
0
votes
1answer
244 views

Red Suffers More Artifacts Than Other Colours. Why? [duplicate]

The Red Compression Issue Red is one of the colours I use most often in my graphic design for marketing. However, despite it being a good colour to use in marketing advertisements, it also suffers ...
0
votes
2answers
67 views

Lose watermark quality when saving for web in Photoshop CS6

So I have applied a watermark to my image which is originally 1.37MB in size. I usually go to File > Save for web to reduce the size of the image appropriately as the image will be used for a website....
3
votes
2answers
585 views

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

Update 1: I've fiddled around with different images after reading Yorik's comment “. . . AFIAK gifs do not store the whole image per-frame, but rather sub-frames that change.” It does seem like ...
1
vote
2answers
383 views

Is it possible for me to get an interactive PDF with high resolution images, yet a small file size? I'm talking under 5mb

I am trying to create a digital portfolio of my work that I can email to employers. I want the images to be high resolution so my work is not viewed blurry and you can see some of the details in the ...
1
vote
1answer
36 views

Does InDesign convert all images to JPEG when exporting to PDF?

When I'm exporting in InDesign,the compression settings say that I am able to change the dpi and chose the format of the compression. Does this mean that if I select 72 dpi and JPEG format all the ...
2
votes
2answers
908 views

Saving PNGs in Photoshop—compression specific question

I create artwork on Photoshop and occassionally print this artwork on physical products. That said, I save all of my artwork in PNG since is of better quality and has transparency. Shen you save a ...
-1
votes
1answer
364 views

From jpg to png with similar size

I have a jpg that it has 414 KB. For different reasons I need it to be png. I tried to export it to png and then it is 2.1 MB. Is there a way to export from jpg to png with similar size and similar ...
0
votes
3answers
691 views

How to reduce product image size with quality for eCommerce website?

I have to upload alot of product images to an eCommerce website. Dimensions are now 600x600px and image size 200-300kb. I want to batch reduce the file size of these to under 70kb.
4
votes
4answers
9k views

How do I optimize an animated gif for Google AdWords?

Creating GIFs designed for the Google AdWords platform can be tricky, given the file-size constraint of 150Kb. I looked for examples online and found this page: http://bannerspiration.com/gif Not ...
3
votes
1answer
3k views

SVG or SVGZ, what should I use? [duplicate]

I tried compressed plain SVG (.svgz), the files are smaller and it looks the same than the regular .svg. Is there any downside? Can I use always .svgz?
1
vote
1answer
9k views

Inkscape: how to compress image in SVG?

I have a JPG image file (3000px x 1000px) which size is about 1 MB. I embedded it into Inkscape, drew vectors above the image and saved all of them into an SVG file. Now the file size is about 12 MB. ...
3
votes
1answer
122 views

What determines if an image can be compressed and when it stops

I ran an image I grabbed off Google through TinyPng's website. The image was compressed, something like 21%. Out of curiosity I put it in again and it was compressed again, by a much lesser value. I ...
1
vote
1answer
72 views

How to make right color compression for internet images? [closed]

How to make right color/image compression for internet images? I adjust images in the Adobe Lightroom, then I export them to the Adobe Photoshop (there are already some changes - pictures looks more ...
1
vote
0answers
68 views

Target what svg compressor option messes up file for sketch 3

I am using https://jakearchibald.github.io/svgomg to compress my svg image, its pretty good at what it does, but after running image through it, sketch 3 messes it up and it looks like this: Where as ...
0
votes
1answer
1k views

Remove lines from transparent edge of compressed png. image

I'm using Photoshop to save illustrations with a transparent middle as a compressed png. file (18% of the original size). When compressing, thin grey lines appear around the transparent edge. These ...
0
votes
1answer
2k views

Need to Compress/Reduce ai File

I have a 13.7 mb ai file I need to email (from my iMac) to a a few screen printing companies. Their minimum file sizes are 10 and 12 mb. Can anyone recommend a good app for me to use to reduce or ...
1
vote
1answer
784 views

How to save a Facebook Banner so it is optimized for BOTH mobile and web?

I'm trying to add a new banner image to my Facebook page. It's the correct size of 851x315 and I have saved it in both JPEG and PNG, clocking in at 77Kb. The image looks fine on Desktop but when I ...
0
votes
2answers
5k views

Reduce File size of PDF Created In InDesign [duplicate]

I created a simple PDF file in InDesign where I placed 15 jpegs of dimensions 2480x3508 pixels of 300 dpi and included a few hyperlinks. Each page has one image. The resultant file size of the pdf ...
2
votes
4answers
3k views

How to get a non pixelated illustration upload to social media (mostly FB)? [duplicate]

Intro: I'm not a GD, but bear with me. I've been doing digital illustrations for a while and never had an issue with posting them anywhere, until this year. I keep getting all my illustrations sort ...
0
votes
1answer
181 views

Does it make any difference compressing a file during exporting or after?

I have an InDesign file with a number of vector images in it. I was wondering whether it made any difference whether I exported a full quality version and compressed the resulting pdf or exported a ...
10
votes
4answers
8k 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?
3
votes
2answers
419 views

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

Can GIFs be optimized so that only the changed regions (pixels within certain rectangular bounds per frame) are rendered / calculated in the final filesize? This is assuming that by default - each ...
0
votes
1answer
269 views

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

I'm working with a color logo created in Illustrator. When it's exported as a PNG at a large size, it looks fine. If I export it at a smaller size, it creates a faint black line between the colors. I'...
3
votes
1answer
5k 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 ...
3
votes
1answer
4k views

Transparent png shadows are filled

When I store transparent images with shadows as .png I have filled areas instead of soft edges. It seems like it is a saving/compression or whatever problem because the .psd is in photoshop really ...
10
votes
4answers
124k views

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

I have a PNG file that is 2042 x 1250 and is 6.1 MB. When I open with Photoshop and do "Save As > PNG 24" and choose the compressed file size of the two options (the other being no compression) I ...
4
votes
2answers
1k views

Compress large PDF files in Illustrator

I have a large PDF file (5 MB+) which is generated from a large dataset. The amount of details in the plot are very fine, which makes it nearly impossible to handle in Illustrator. I want to ...
0
votes
1answer
140 views

How to make my magazine online?

I have created magazine in iD for print. Therefore its size is very big. How can I comprime its size so I can use it online? Maybe some settings of iD would help or software? How do you publish pdf ...
0
votes
4answers
7k views

How to reduce file size without losing quality

I have a TIF image created from a flattened PSD file. It is presently sized to 20"x 20" image size, resolution is 300 and pixels are 6000 x 6000. I sized it this big so when I take it to the printer,...
2
votes
4answers
9k views

Changing File Sizes in a PDF

Is there a way when exporting a .psd as a .pdf to make the file smaller? My client always has me work in Photoshop and send them finished work as .pdf's, but they say the files are too big. These ...
2
votes
2answers
775 views

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

On a website I'm working on, the design team wants a large background image. Uncompressed, it is several hundred kilobytes (both in JPG and PNG). Most parts of the background image are blurred, but ...
1
vote
1answer
865 views

In Acrobat 11 where is the PDF settings panel for PDF Optimizer?

Acrobat 11 is much different than Acrobat 9 but I was wondering where is the panel for PDF compression settings. In Acrobat 9 you could go to Advanced -> PDF Optimizer:
4
votes
2answers
4k views

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

I am creating figures for a scientific paper. The journal I am submitting to seems confident "all figures can easily be reduced to less than 50kB each (gzipped) without significant loss of quality". ...
3
votes
2answers
57k views

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

I'm doing class project that is a four-page, seven-image document with very little text. The project must be submitted as a PDF under 300 KB. However, when I export the document under the smallest ...
2
votes
2answers
3k views

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

I know that each time a .jpg file is saved, it is compressed and loses quality. Is the same true for .png files?
1
vote
0answers
664 views

How do you export a jpeg with a selective compression mask from Photoshop CC 2014?

In fireworks, I can select parts of an image to keep at a lower compression (85) when exporting, leaving the rest of the image to be compressed at the higher setting (60). I cannot find that option in ...
15
votes
5answers
3k views

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

I'm currently dealing with a problem of image quality for my website background image. I have a big blurred background image I'd like to use but would like it to be as small as possible in size for ...
3
votes
3answers
8k views

How to reduce the file size of a web banner image with Photoshop?

I need to change the file size of an image I created in Photoshop without changing the dimensions for a banner ad on the web. How do I do this?
0
votes
2answers
2k views

Illustrator - Large Vector File to Print at A0

I have created large vector drawings for A0 printing - each file has thousands of vectors at different transparencies. The largest file is 270mb when saved as an editable pdf. I have not compressed ...
2
votes
1answer
2k views

How do I compress/zip files in Bridge?

I use Bridge for my workflow but I always have to right click > Reveal in Finder to zip a folder. There is no option to do so when I right click in Bridge, as there is in the Finder window. Am I ...
2
votes
2answers
3k views

Compress png images with Gimp

I'm getting a message from PageSpeed Insights that recommends to compress some png images. E.g: If compressing .../logo.png without loosing information, you would save 1.014 B (12% redcuction). ...
1
vote
1answer
1k views

Image compression - what is the best way?

What is the best way to compress images to satisfy Performance Review on Web Page Speed test on webpagetest.org. Here's how I do it: 1) Save for Web in Photoshop from original PSD with quality set ...