InD blocking Ps to save a file / Could not save * because the file is already in use error

Question

Many users have reported a  Photoshop Could not save * because the file is already in use error in many different circumstances.
I place raw jpgs in InDesign document, then open them in Photoshop via Edit original order to adjust them. On random occasions Ps gives me that annoying error. So i found a little trick to avoid saving that image under a different name and relinking it plus reloading Ps since the error repeats on other pictures to.
All you have to do is: when Ps gives error, (Cmd-Tab) switch to InD, directly select the worked jpg in image frame (one that you try to save in Ps)  and simply move it left-right (or move it and Undo). Now you can save it without problem.

Answer 1

JPEG is a "lossy" compression format. Every time you save as jpeg you recompress and throw away a little more information. In addition, jpeg does not support transparency or layers, both very useful features for woring with images. For example, you can add an adjustment layer in Photoshop to do your adjustments non-destructively for may of the things that you can do using Image > Adjustments... which will change your pixel data permanently. Throw away an adjustment layer and you image data is untouched. Also, ID allows you to place a layered image and control layer visibility from within ID, making it possible to multi-purpose a single file by showing or hiding various layers.