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Panorama with a sky problem

PostPosted: Wed Jul 25, 2018 6:29 pm
by Alron
Brodswoth panorama.jpg
Brodswoth panorama.jpg (976.8 KiB) Viewed 421 times
Hi guys.yesterday posted 4 images, after submitting them, like a sore thumb image 1,the sky looks like its been squeezed :eek: how I managed to not see it before, so what have I done wrong if you can help with why its looks like that I would appreciate your comments.

Its a 3 image stitched panorama, settings, raw files. Aperture F10. Exposure 1/100. ISO 100. Focus centre weighted. Tripod used.

Panorama with a sky problem

PostPosted: Thu Jul 26, 2018 8:52 am
by MrB
The banding in the sky is probably due to the JPEG file compression. The posted image is quite large - 7177 x 2747 pixels - but the file size is relatively small - 976 KB. This indicates a high compression factor was used in saving the JPEG image. For display via the Web on a monitor, the image size doesn't need to be any more than about 2000 pixels wide so, to produce a small file size for uploading, it would be better to down-size the image but save the JPEG with low compression (e.g. quality level 10 in PS or PSE). The following examples are to illustrate the point:

1. Large image (6000 x 4000 pixels) but with high compression, file size = 700 KB:
IMGP1905x.JPG
IMGP1905x.JPG (700.22 KiB) Viewed 397 times


2. Small image (1800 x 1200 pixels) but with low compression, file size = 612 KB:
IMGP1905y.JPG
IMGP1905y.JPG (612.02 KiB) Viewed 397 times


Clearly there is banding in the first and the second looks much better.

Cheers.
Philip

Panorama with a sky problem

PostPosted: Thu Jul 26, 2018 10:37 am
by aliengrove
Resize the original image as a Tiff or Psd file, then convert it to Jpeg. In my experience, resizing straight from the Raw file or a Tiff to saving as a Jpeg often causes banding.

Panorama with a sky problem

PostPosted: Thu Jul 26, 2018 6:31 pm
by Smeggypants
I opened image #2 up in photohsop and saved it with the lowest compression and it came out banded, but not as bas as the example in #1

Re: Panorama with a sky problem

PostPosted: Thu Jul 26, 2018 7:13 pm
by Alron
Thank you guys appreciate your views,Phlip the two images that you have included thats great, I will re visit that problem sky.
Alron.