They aren't "hot" links but the HTML code on the page is forcing them to show as much smaller images than they actually are. My point is that it's not this artificial shrinking that's causing the banding. It's the JPG compression factor that he used that's causing it.hartpaul wrote:
The images that he gave links for did not link to larger images, but if so then Iani should also tell us the size of these final images as well. His "Thumbnails?" seem to have very faint banding in the sky so am guessing that is what he is referring to.
Blue Sky Backgrounds
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LindaSue
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Re: Blue Sky Backgrounds
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Re: Blue Sky Backgrounds
Thank you Ian,
After trying a lot, I must admit that it is impossible to obtain exactly what you want.
If you need to place a 350 Kb image on your web page but in it's original size (2684x1732 pixels), you must use a JPEG compression rate of 50 % and more (say 60%). In areas of uniform color (blue sky), banding occurs when using such a high rate of compression.
My idea was to add gaussian noise (10 to 20 % or more) before to apply the JPEG compression. This limits the banding effect but doesn't remove it if more than 30% compression rate is used.
I suggest you place a 430x290 image on your web page and link this reduced image to the original image on your web site. When clicking on your 430x290 image, the user will see the big image. See this process on my website (source code is visible):
http://www.stanleyville.be/regina.html
Under "Fevrier 2010", click on the image. You will access to the original size.
Best regards,
Jean-Luc Ernst
After trying a lot, I must admit that it is impossible to obtain exactly what you want.
If you need to place a 350 Kb image on your web page but in it's original size (2684x1732 pixels), you must use a JPEG compression rate of 50 % and more (say 60%). In areas of uniform color (blue sky), banding occurs when using such a high rate of compression.
My idea was to add gaussian noise (10 to 20 % or more) before to apply the JPEG compression. This limits the banding effect but doesn't remove it if more than 30% compression rate is used.
I suggest you place a 430x290 image on your web page and link this reduced image to the original image on your web site. When clicking on your 430x290 image, the user will see the big image. See this process on my website (source code is visible):
http://www.stanleyville.be/regina.html
Under "Fevrier 2010", click on the image. You will access to the original size.
Best regards,
Jean-Luc Ernst
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Re: Blue Sky Backgrounds
Hi everyone,
Wow thank you all so very much for your input, suggestions and kind words. I’m quite overwhelmed. Hope one day I can do the same for someone.
FYI, and to cover some comments you have made. My original “novice” approach was to just get each photo down to a size that would load up on the Net faster than the 3MG originals. I chose 70% - 75% as I thought that would (naively) not compromise the quality of each shot. Pixel size I had no clue on but you guys have now educated me in that area as well. I do not propose to add thumbnails or links to the originals. The main focus of the website is the historical / research aspect especially for Australian Genealogists. But I did want “nice” shots included. The final size of the photos on each web page was predicated to an extent by the website software I’m using, all be it, a very old package. The site is being coded properly next month.
And finally thanks for the step by step suggestions. They are all so very helpful.
Wow thank you all so very much for your input, suggestions and kind words. I’m quite overwhelmed. Hope one day I can do the same for someone.
FYI, and to cover some comments you have made. My original “novice” approach was to just get each photo down to a size that would load up on the Net faster than the 3MG originals. I chose 70% - 75% as I thought that would (naively) not compromise the quality of each shot. Pixel size I had no clue on but you guys have now educated me in that area as well. I do not propose to add thumbnails or links to the originals. The main focus of the website is the historical / research aspect especially for Australian Genealogists. But I did want “nice” shots included. The final size of the photos on each web page was predicated to an extent by the website software I’m using, all be it, a very old package. The site is being coded properly next month.
And finally thanks for the step by step suggestions. They are all so very helpful.