If a jpeg is natively compressed with this progressive feature turned on, then I think Picasa might just be displaying it that way, just like you would see in a webbrowser.īut what about JPEG's that were not compressed progressively? Well according to the wikipedia article on JPEG, it is possible to losslessly add this progressive option to a JPEG image. JPEG images can be stored in a "progressive" format, which means if your browser is trying to download such an image on a webpage, then you first see a really lowres version of the image, and as more of the image is downloaded, the image becomes clearer. I have never used Picasa so maybe this is wrong, but after reading this thread I think I have an idea of how Picasa might display proxy images quickly. How does it create in real-time a medium res proxy (that is much higher in resolution than a thumb) from a file format that doesn't support multiple resolutions, without having to read the entire file first? My Picasa database doesn't look big enough to house pre-built half-res proxies for all the images that Picasa sees (thousands!). My guess is that Picasa has an intelligent algorithm that decides what kind of proxy to pre-build based on file size. Some appear to be as much as half resolution.
![better than picasa photo viewer better than picasa photo viewer](https://winaero.com/blog/wp-content/uploads/2015/10/IrfanView-in-Windows-10.png)
Not all Picasa image proxies are from the thumbs. Is the Picasa image proxy the same as the thumbnail? I never thought about that before! Hmmmm.
![better than picasa photo viewer better than picasa photo viewer](https://miro.medium.com/max/3544/1*GUWBrW1Sa-6oy2lsrUge7g@2x.jpeg)
I can double-click an 100Mb image in the Picasa file list and the proxy (ie, a blurry but recognizable) image loads into the editor literally instantly. Picasa is really amazingly fast, even with enormous images.
Better than picasa photo viewer full#
Thibaud wrote:on the same subject, do you plan to implement an instant low-res (scaled thumb) displayed while the full res image loads ? (like in Picasa 3)