Downsampling algorithm for JPG images in both PDF or automatic mode

Hello,
the question is: which algorithm is used when images are formatted by the Folio Builder in the Folio or Articles properties?
My question is focused on the static images and I know that it would be better to resize images before placing them in the document.
The question is also related to the image format.
If I use a non-compressed format such as the TIFF (without compression) then the images are re-formatted as JPG or PNG.
We know that both automatic and PDF option saves images as JPG or PNG depending by the transparency contained in the graphics.
After this considerations I think that save static images as PNG before placing them in InDesign document could be a solution to obtain images without any compression.
Am I right?

Thanks Ankit,
but in the article there is no response to my question: which algorithm is used to downsample the images and wich is the best way to mantein the images quality in both Automatic and PDF.
This is the problem.
Thanks

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