On Thu, Sep 25, 2014 at 12:50:42AM -0400, Igor PDML-StR wrote: > > While processing photos that had a lot of blue sky in them > (from Dallas Hot Air Balloon Festival), I noticed an interesting effect: > while LR (3.6) is loading the full preview, it is showing some lower quality > preview (from the thumbnail?), and there is clear bending effect showing in > the sky area. > Once the full preview is loaded, no bending can be seen. > I haven't seen this type of effect in any of the previous photos. > > I wonder what could be different with these photos... higher dynamic range > in the sky? Stronger gradient? > > Any thoughts? > > Igor
I assume you mean "banding" :-) Large areas of sky are the parts of a photograph where you are most likely to see banding, because that's the most common case of a large area with uniform weak colour gradients. The easiest way to see this is to generate JPEGs with smaller and smaller file sizes; the smaller the file size the more pronounced the banding will be. The embedded preview JPEG generated in-camera will use a fairly low quality setting. There's also the fact that the human visual system is exceptionally good at spotting patterns, so you pick out the edge of the bands and enhance them. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
