Many small partners use PS in their daily work, and they are naturally familiar with the file save box. However, when saving JPEG images, the most used is the "quality" slider, as the formatting options below are rarely involved.
So the question is, what do you mean by “baseline (standard)”, “baseline optimized” and “continuous”? Today, I will explain it to everyone.
- Baseline standard
- Baseline optimized
- Continuous
In simple terms, all three options control the size of the JPEG, which means that the JPEG images generated by the three formats are the same size under the same quality.
Among them, "baseline (standard)" produces the largest picture, but the compatibility is the best. "Continuous" generates the smallest picture, but not all browsers open normally.
The same file is saved as three JPEG format volume comparisons in the case of quality 12
2. Baseline (standard)
First explain a noun, "baseline" means progressive scan, this is a bit like the imaging technology used in CRT monitors of the last century , which means that the pictures are displayed line by line.
For most image display tools and browsers , this format saves the best image compatibility and saves the fastest. But the price is that the generated image is the largest.
Baseline (standard) produces the largest image size, but there is almost no compatibility issue when opening and displaying
3. The baseline has been optimized
“Baseline Optimized” is algorithm optimized based on the original format and is an optimized version of the baseline (standard). In addition to the basic principles of maintaining baseline storage, the volume is reduced.
I have to mention the famous Huffman code here. Maybe you have seen this term in other software. PS uses Huffman code here.
Although Huffman coding can greatly reduce the size of the picture, and the display effect is not worse than the standard baseline, but a little bit of compatibility, some old version of the image software does not accept this format.
Continuous
Unlike the "baseline" progressive scan, "continuous" uses multiple scans to display the image. The popular understanding is that the picture will gradually become clearer.
This format allows the user to customize the number of scans. For example, the default setting of "3" for PS means that the picture will be clearly divided into three times when it is finally displayed.
Like "baseline optimized", "continuous" can also cause incompatibilities in some browsers, and this format consumes a lot of memory for the computer. If the working machine has a small memory, use this format to store large-size images. When it is, it will be easy to pop up the software error.
The size of the images generated by different times is different, but the image quality is basically unchanged.
"Continuous" allows the user to customize the scanning frequency from 3 to 5. Different scan times have an impact on the size of the image, but basically the same level. It should be noted that the number of scans is not related to the image quality, and no difference can be seen in any setting screen quality.
Written at the end
To sum up, in the three JPEG formats, “baseline (standard)” is suitable for most situations. If it is local document output, then “baseline (standard)” is the most appropriate.
Both “baseline optimized” and “continuous” can significantly reduce the size of the picture, especially “continuous”, and its unique gradual clarity makes it more suitable for network transmission.
However, "continuous" has higher requirements for computer memory. If the size of the image to be saved is large, or the memory of the working computer is small, it is not suitable to select "continuous" and "baseline optimized" should be used.
By the way, the browser has mentioned browser compatibility issues more than once. In fact, this is a long time ago. For most computers and software, reading the "baseline optimized" and "continuous" formats is no problem.
In addition, these three formats have little change in image quality, and basically no difference is found. The biggest difference is the file size.
Ok, this is the question about the JPEG save format that I want to share with you today. Have you learned it?
