panorama software,virtual tour software
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Joined: 2005-04-18
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2005-10-31
#1

How to reduce picture

Hi everyone

 

Ive got a question about the best way to reduce an image.

 

When I have stitched two image the size will be 3072 X 1536 pixels.

I understand the best results for tour wave is an image 1500 X 750. When I reduce the image this will affect the image. I do reduce the image in photoshop and save it as a web image.

 

Thanks Johan


J.G.
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2005-10-31
#2
resize it in PS then save FOR web.
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2005-10-31
#3

Once you have reduced the image size, use unsharpen in PS or one of the proprietory sharpen plugins like "Ultra-Sharpen". Some suggest you reduce the image size in stages at say 10% reduction a time, sharpening after each reduction - could take 4/5 stages, see what works for you.

Best size for TW depends on your screen size, most advise roughly a ratio of 1:3.5  i.e. screen size 400x300 - final image size 1500x750 if you screen size is smaller i.e. 300x200 a final image size of 1200x600 would be fine. Screen size 600x400 final image 2000x1000 etc etc

Its all down to trial and error really to find settings that work for you. I prefer to use a final image size of 2000x1000 for a 400x300 screen size,and then save for web - the file size ends up a bit bigger but I find the quality is better.


aj
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2005-10-31
#4
IN PW you can also stitch to the end size of  image required, therefore you do not have to resize in PS.
aj
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2005-10-31
#5

Thank You for all answers

 

The reason I ask this question, Ive made a tour of the city I live. When Ive published the tour the tour is stocking and the image didnt turn smooth.  My image in that tour size over 2mb 3072 X 1536 pixels. The results of the reduction of the image is not so satisfy. I will do it all over again I suppose. Look the example. http://www.jgfotografie.nl/Tourviewer_Tourviewer_Amersfoort.html

 


J.G.
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2005-10-31
#6

I tend to stich to the highest available size I can. This depends on the input image size. ie Image size of say 3300x2200 would let me stich a 6000x3000 pano. I'll always keep this pano as a base image with which to work on later.

Workflow:

  • Take 3 shots each 90 for blending purposes (I only shoot in RAW)
  • Do any RAW pre PS work u desire and out put as tiff.
  • input the 3 tiffs to PS and blend for blown out windows, shadows and so on. Save as tiff.
  • Input ur 4 shots + top in PW and stich & save as bmp.
  • Convert to cubic and input to PS to do any nadir and zenith repair work only and again save as bmp, reconvert to equirec pano and save as bmp.
  • Input pano to PS and do any repair work needed and colour corrections required. Save. This is ur base image for file purposes.
  • Resize to desired image size (I tend to resize to the 1:3.5 however here is a comment from Erik Krause)(Depends on your maximum zoom setting. If your maximum zoom is 60 and your
    viewer is 400 pixels wide you need an equirect size of 2400px (= 400px *
    360/60) if you want to allow zoom in to pixel resolution. Your above example
    would allow for about 103 minimum FoV (max zoom) = 360/(1400px/400px).

    This is an approximation for the image viewer window center of course since in
    the corners the equirect pixels get stretched - which is the less of a problem
    the narrower the FoV is.)

  • So before I resize I tend to take the image through noise ninja, resize to eg.1500x750, do a ffinal run of unsharpen at approx 50% and save to web. File size teends to be around 120-180kb depending on image kompression... I tend to save at 35-45% as jpg.

i only ever do any sharpening as last step. i've not yet tried to step down bit by bit when resizing. Never save as jpg unless it#s to be published.

Hope that is useful


If I only had an hour to chop down a tree... I'd spend 45 mins sharpening the axe.
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2005-10-31
#7

Thank you all.

I am sure this information is useful. I go to do some tails.

The examples you giving me is not exactly the same to my because I use a circular fish eye. But anyway you have given me a lot of useful information I can work with.

 

Johan.

 


J.G.