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[jjsmulo Friend jjsmuloJoin date: March 2007Posts: 70Downloads:0Uploads:10 Thanks: 10]

#150782

Hello,

For some reason the images, especially around the text, are pixelating in JA Slideshow2. You can see here http://sacramentosbaloans.com/

But the images are fine, for example see http://sacramentosbaloans.com/images/slideshow/slide1.jpg

Any idea why this is happening? I thought it might be the images resizing, but they are the exact size they should be. Thanks.

[John Wesley Brett Moderator John Wesley BrettJoin date: July 2013Posts: 2142Downloads:17Uploads:26 Thanks: 175 Thanked: 645 times in 426 posts]

#342266

[FONT=”Arial Black”]RED!![/FONT] It is one of those mysteries that has confounded man for decades.

[FONT=”Arial Black”]Why this is happening?[/FONT]

Because bright red pigments are more easily come by than other
colours, and evolution has tuned plant fruits and flowers and animal
eyes to prefer it and to be most sensitive to small difference in red
quality. So it tends to be both the brightest colour in most images,
which means it’s the first to reach saturation and overexposure,
especially when the jpeg quality is set to the vivid oversaturation
most people like, and especially when the colour temperature of the
light is lower than white, which it often is.

All of which then gets exaggerated by jpeg compression artefacts in
the colour to whose quality we are most sensitive. Especially in cheap
cameras which use low quality jpeg compression for reasons of economy.

[FONT=”Arial Black”]What you can do about it?[/FONT]
Because RED does this…or we perceive it to…you need to either –

+ Use the HIGHEST QUALITY image compression

If you are saving the image in Photoshop using “Save for the Web”
make sure the jpg setting is set to the highest setting (Extreme)…which, yes,
will mean a MUCH higher file size., and yes…may still result in pixelation….or…

+ Or simply save the image in either PNG or GIF format

Remember….the above is only necessary when RED is the predominate colour.

+ Or simply change the dominate colour to something else.

Are you sorry you asked? LOL!
Have fun!
John.

[jjsmulo Friend jjsmuloJoin date: March 2007Posts: 70Downloads:0Uploads:10 Thanks: 10]

#342312

Thanks for the response. Its not what I would have thought as a potential problem!

I’m not sure this is the problem in this particular case though. I’ve saved them in PhotoShop using Save for the Web at “maximum” and this didn’t work. I’ve also tried saving as a .gif and .png24 and that didn’t work.

Also, it looks fine when I pull them up like this http://sacramentosbaloans.com/images/slideshow/slide1.jpg. Any other thoughts? I really think the resizing issue might be it.

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