Uploaded Images Reduced in Size and Quality

[JetsetBkk]

Have a look at this post:

http://www.thaivisa.com/forum/topic/666286-which-new-tv-to-buy/?p=7902802

That image is now 54.1 Kbytes (size measured after downloading).

Before I uploaded it, it was 2 Mbytes and crystal clear.

What am I doing wrong?

[Langsuan Man]

Before I uploaded it, it was 2 Mbytes and crystal clear.

Your attachment exceeded the maximum file size that is allowed to be uploaded by 2X, Try reducing it to the allowed 1 MB limit and see if that works

[george]

Images are compressed by the content delivery system.

[JetsetBkk]

Before I uploaded it, it was 2 Mbytes and crystal clear.

Your attachment exceeded the maximum file size that is allowed to be uploaded by 2X, Try reducing it to the allowed 1 MB limit and see if that works

file size.png

The limit is 100MB. The file was 2 MB, not 200!

.

[JetsetBkk]

Images are compressed by the content delivery system.

Here are different sized images of the original web page image:

1 MB -- 500 KB -- 250 KB -- 100 KB -- 72 KB

. . . .

The sizes before uploading and after:

Original > Uploaded

1 MB > 54.16 KB

500 KB > 54.19 KB

250 KB > 54.36 KB

100 KB > 43.44 KB

72 KB > 61.40 KB

The original images on my PC are clear, apart from the 100 KB and 72 KB files. But none of these files is clear when read on Thaivisa.

However, take a look at this picture, George:

It was 508 KB originally, and stayed at 508 KB on Thaivisa! The "content delivery system" didn't change it.

Please, George, can you ask your developers what is going on with these images/files because it doesn't make sense to me that all of the web page images got compressed so much that they are unreadable, but the 500KB image of a Google Earth scene was untouched.

[Langsuan Man]

As long as George is talking to the development team: Why do certain posted images force the page borders to change, so that we have to scroll right and left for all content on that particular page ?

Asked but never answered here:

http://www.thaivisa.com/forum/topic/716849-page-scrolling/

[george]

JetSet: Thaivisa is serving its content and optimizes graphic content via Google's infrastructure at nodes around the world:

https://developers.google.com/speed/pagespeed/service/OptimizeImages

I will ask them to adjust a few settings to make a better experience.

Langsuan Man: I will have a look at this, i suspect it's a bug in the forum software. This happens when members are posting too wide images and the software has been unable to resize them. I have seen this happen in Firefox mostly.

[Tywais]

As long as George is talking to the development team: Why do certain posted images force the page borders to change, so that we have to scroll right and left for all content on that particular page ?

Asked but never answered here:

http://www.thaivisa.com/forum/topic/716849-page-scrolling/

That issue was a different one then this one in that it was associated with badly formatted text in a post which I have now answered in that topic and corrected in the post having the issue. Not an image issue in that case.

[Tywais]

I did several tests on image attachments. I attached image sizes of 1024x768, 1500x1125, 2048x1536, 4160x3120 and a portrait one of 1024x3227. All images larger than 1200 wide were autoresized downward by the board software to 1200 pixels wide and re-sampled, that is re-compressed to a much higher compressed sized. Example the 4160x3120 image as an attachment 2.5MB. Rescaled to 167kB, resized to 1200x900 after uploading.

No issues with displaying them as they all downsize to no more than 1200 pixels wide.

Now where the issue comes from are images that are linked from an external site. Though FF has as default to auto resize images to fit the screen, a conflict somewhere between FF and the Invision software is preventing it. With Chrome, these very large external site images autofit with no problems.

An example, if I have, let's say a 4000 wide off site linked image, horizontal scroll bars will show. However, if I click on that oversize image it will come up in a popup window still oversize but if clicking on the Save option on the bottom right of the image it come up in a new tab auto re-sized correctly with the magnifying glass showing such.

In summary, attachments will not cause the scroll bar issue but remote linked images will if larger than the members screen resolution.

//edit - @Jetset - the image that didn't change file size is one that was less than 1200 pixels wide and didn't get sent through the rescaling algorithm of the software thus maintaining it's original properties.

[JetsetBkk]

JetSet: Thaivisa is serving its content and optimizes graphic content via Google's infrastructure at nodes around the world:

https://developers.google.com/speed/pagespeed/service/OptimizeImages

I will ask them to adjust a few settings to make a better experience.

<snip>

<snip>

//edit - @Jetset - the image that didn't change file size is one that was less than 1200 pixels wide and didn't get sent through the rescaling algorithm of the software thus maintaining it's original properties.

Thank you guys - your comments are much appreciated.

I've been playing some more and found that the original web page (1144x5015) gets rescaled because of its length. So after editing it - basically, splitting it in two, joining the halves side by side and reducing the overall size to 1157x1400 - it gets uploaded without rescaling, and it is readable (just):

Edited June 7, 2014 by JetsetBkk

[Tywais]

@JetsetBkk - Yes, that was the next set of tests I was going to do when I had time and that was to find the vertical threshold of landscape images that triggers the resizing algorithm. Appears to be a WxH ratio relationship happening.

[JetsetBkk]

@JetsetBkk - Yes, that was the next set of tests I was going to do when I had time and that was to find the vertical threshold of landscape images that triggers the resizing algorithm.

I think I've just done that for you

And I reckon it's 1200 x 1600 before the resizing occurs:

1200x1600:

- not resized

1200x1601:

- resized

1201x1600:

- resized

[Tywais]