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12-19-2017, 05:38 AM   #1
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What is the best way to show images?

I uploaded a couple photos and the system apparently downsized
them to where some of the detail and sharpness is gone.

What is the best way to submit images in order to retain the original
level of detail?

12-19-2017, 05:58 AM   #2
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sRGB colour space, less than 800 pixels on the long side, sensible compression
Still, it might be better to find a web photo gallery and upload there, then just link or embed. Flickr, 500px, there are plenty of options, and some are even free. Of course, they have their own limitations. And they might do their own processing, as Flickr has been known to do
12-19-2017, 05:59 AM   #3
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As long as the dimensions are below the maximum, our system won't alter your files. For attachments, the maximum.dimensions are 1400x900, and in albums, 1280x1280.

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12-19-2017, 09:16 AM - 2 Likes   #4
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QuoteOriginally posted by Adam Quote
As long as the dimensions are below the maximum, our system won't alter your files.
While that is true, the file rendered image may still be resized in the browser depending on window size, user settings, and which skin is being used. Some of the skin choices have potential to severely limit horizontal image dimensions, requiring the browser to resize. That is why I suggest one of the "classic" skins for this site.


Steve


Last edited by stevebrot; 12-21-2017 at 11:42 AM. Reason: Accuracy
12-19-2017, 07:15 PM - 1 Like   #5
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QuoteOriginally posted by stevebrot Quote
While that is true, the file may still be resized in the browser depending on window size, user settings, and which skin is being used. Some of the skin choices have potential to severely limit horizontal image dimensions, requiring the browser to resize. That is why I suggest one of the "classic" skins for this site.


Steve
But this has the potential to improve the image quality, rather than degrade it, since you get more resolution in less space.

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12-19-2017, 11:11 PM - 1 Like   #6
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QuoteOriginally posted by Adam Quote
But this has the potential to improve the image quality, rather than degrade it, since you get more resolution in less space.
For a recently shared photo, my browser tells me that a 25% reduction in resolution (1024x507 ==> 880x436)* was required to fit the image to the default Modern skin. The Gecko rendering engine in Firefox does a decent job with the down-sampling, but even those efforts are at best a graceful degradation.

The Classic skin I typically use displays the full resolution I shared from Flickr.

I was unaware of this feature of the site until I fielded a question from a user about a year ago asking why photos shared here lacked the crispness of what they uploaded to Flickr and why they were so small. I checked the page and what I saw were highly detailed full resolution 16 Mpx JPEGs shared from Flickr. It turned out that we were using different skins and they a smaller monitor.


Steve

* The actual max width style declaration in the Modern skins varies dynamically by browser window size.
12-19-2017, 11:13 PM   #7
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QuoteOriginally posted by stevebrot Quote
While that is true, the file may still be resized in the browser depending on window size, user settings, and which skin is being used. Some of the skin choices have potential to severely limit horizontal image dimensions, requiring the browser to resize. That is why I suggest one of the "classic" skins for this site.


Steve
If you are using Firefox right-clicking on the image and choosing "View Image" will show the full-sized image with the little magnifier image show you view it resized smaller.
12-19-2017, 11:29 PM   #8
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QuoteOriginally posted by Not a Number Quote
If you are using Firefox right-clicking on the image and choosing "View Image" will show the full-sized image with the little magnifier image show you view it resized smaller.
Yep...and good advice!


Steve

12-20-2017, 01:11 AM   #9
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QuoteOriginally posted by stevebrot Quote
Yep...and good advice!


Steve
Also, you can change your user cp settings and disable scaling entirely.

If you have a 4K monitor the scaling is worth keeping on IMO, otherwise it can be disabled for the best possible IQ.

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12-20-2017, 08:18 AM   #10
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QuoteOriginally posted by Adam Quote
Also, you can change your user cp settings and disable scaling entirely.
Sadly, this does not work with the Modern skins and my browser (Firefox 57.0.2 on Win 10 Pro). I just gave it a test drive with my laptop (1366x768 display) and images were still scaled. It is not a big deal and is just something that keeps me with the classic skin.

As for 4K...none such here. I have no idea what happens with that class of display.


Steve
12-21-2017, 02:07 AM   #11
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QuoteOriginally posted by stevebrot Quote
Sadly, this does not work with the Modern skins and my browser (Firefox 57.0.2 on Win 10 Pro). I just gave it a test drive with my laptop (1366x768 display) and images were still scaled. It is not a big deal and is just something that keeps me with the classic skin.

As for 4K...none such here. I have no idea what happens with that class of display.

Steve
What about choice of operating systems, too? I'm a long time Linux user (Debian Stretch/Stable at this second) so I'm familiar with the gradual progression toward more consistent browser experience. It's way better than it ever was, but sometimes it still feels like there are some incompatibility glitches there. Some shtuff occasionally still doesn't work quite as expected.
12-21-2017, 11:40 AM   #12
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QuoteOriginally posted by Somnium Quote
What about choice of operating systems, too?
Hard to say. The scaled image size is coded into the HTML (or DOM as it may be) as an inline style and compliant browsers will scale the image regardless of the underlying OS. The behavior is as is expected.


Steve
12-22-2017, 09:52 AM   #13
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QuoteOriginally posted by jeryst Quote
I uploaded a couple photos and the system apparently downsized them to where some of the detail and sharpness is gone.
What is the best way to submit images in order to obtain the original level of detail?
I guess you mean pentaxforums with "the system".

Resolution:.....For full size display view up to1600px horizontal/1200px vertical (1,9MP), at least 1280x1024px (1,3MP)
Compression:.80-100% quality (or step 8-12 on Photoshop)
Colorspace:....Include the original profile
EXIF:..............should be included too

Sharpening before size reduction is also recommended to reduce loss of details and sharpness.
IrfanView is a good tool to do all these points in one step using the BatchConversion.
12-22-2017, 11:46 AM   #14
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One thing to keep in mind is that what any individual sees is a factor of their monitor, computer and possibly the browser. There is always some "processing" going on and probably in several steps of the way. I personally put all of my photos for display in flickr and even there I scale them to 1/2 or 1/4 of the original resolution to keep the file sizes down and because most people are viewing on a monitor with only a fraction of the resolution of the native photos. And the colors, contrast, etc. are also a factor of the monitor. I guess I don't have an expectation that the photos as viewed on the other end have retained all of the characteristics of the original. I just hope people enjoy what they see
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