Photoshop offers three ways to save jpeg images. Save as, Save for Web and Export as. One of them you shouldn’t use.
This is my reference image which I saved with Save for Web and 65 Quality. The jpeg algorithm is a clever one. It throws away information which your eye can not resolve, but things change when we zoom in…
As you can see below, the compressed jpeg image is divided into blocks. A good compression will maintain more information within these blocks than a bad one.
Save As vs Save for Web
I will skip ‘Export as’ here because it delivers the same results as ‘Save for Web’. The goal was to save an image with the same file-size and to check which method is more effective.
So what do we get here? If you slide between ‘Save As’ and ‘Save for Web’ you should clearly see the difference. I enhanced the contrast in this magnified excerpt to make it even more obvious. ‘Save as’ shows fewer details inside the blocks than ‘Save for Web’.
Another thing I’d like to mention is that you should always convert (not assign Profile!) your images to sRGB and save your jpegs with the profile embedded before you upload it to the web. Some browsers are still not able to show color profiles correctly, such as AdobeRGB or ProPhoto etc.
sRGB is save and will prevent you from pulling your hairs out in some cases.
If you’re using Firefox for example you need to enable color management in order to see sRGB correctly. Write about:config in the adress bar and enter the values as seen below..
Conclusion: Use Save for Web or Export as
A little sneak preview about the upcoming topics:
- Nikon vs Canon
- Lightroom & Photoshop
- The Power of Luminance Masks
– Luminance sharpening
– Luminance highlights
– Luminance colors
- Lets talk about taste
- HDR Obsolete – but if, do it right
- Astro Stacking
- Vixen Polarie
- Common Mistakes