Itqualityassurance
- Is baseline or progressive better?
- What is a progressive image?
- Why are progressive jpegs smaller?
- How do you know if a photo is progressive?
Is baseline or progressive better?
Progressive will appear faster, because it can download a preview of the image in their placeholders as the page is downloading the content from the network. Baseline will appear slower because the users will see the image render from the top first and then making its way to the bottom.
What is a progressive image?
A progressive image is interlaced meaning the image will start out as low quality, however will continue to improve in resolution with each additional "pass". Traditionally, images load from the top-down (for JPEG images these are called Baseline JPEG).
Why are progressive jpegs smaller?
Faster load speed
Generally, progressive JPEGs are 1-3% smaller in size than baseline, even though the image quality is the same. This saves bandwidth and storage, helping your website load faster.
How do you know if a photo is progressive?
Some simple methods:
Photoshop — Open file. Select File -> Save for Web & Devices . If it's a progressive jpeg, the Progressive checkbox will be selected. Any browser — Baselines jpegs will load top to bottom, and progressive jpegs will do something else.
