Attached Image Size on Posts

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Attached Image Size on Posts

Post by marktownley »

Hi All,

If you are uploading images directly to the forum, rather than using a hosting site eg flickr etc, can you try and keep file sizes to a minimum please. If you have large file sizes, above a couple of Mb please consider displaying these via a hosting site, such as flickr etc.

Apart from it being slow for users to see images as they 'load', the forum host, Stephen, has to pay for the server space we use, the more Mb the more $$$ the server costs to run.

As we run out of server space, and the project does not have the $$$ to pay for more server space then we have to delete old uploads, which given the wealth of information on here is a real shame. This often has the consequence of losing a context to a post.

Thanks folks!

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Re: Attached Image Size on Posts

Post by EGRAY_OBSERVATORY »

Thanks for the head's up on this snag Mark.

I would have thought that the use of JPEG's compresses sufficiently without losing any amount of detail, compared to other formats and of course saving not only the server-space, but also as you say about the slow-downloading of images on SolarChat being much quicker if 2Mb or less for us to view...

I will certainly be keeping an eye on any uploads I send to SolarChat, as well as reducing some images - as necessary...

Regards
Terry


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Re: Attached Image Size on Posts

Post by DeepSolar64 »

Hey, Mark,
Since I have started imaging this is certainly of relevance to me. Can you use Dropbox as a hosting site? I do have a Dropbox subscription. I have also considered Astrobin.

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Re: Attached Image Size on Posts

Post by MAURITS »

Thanks Mark, I resize my new images to a smaller size.


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Re: Attached Image Size on Posts

Post by Bruce G »

Last year I volunteered to finance a Dropbox to be owned by the site.
The offer still stands

Bruce G


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Re: Attached Image Size on Posts

Post by yltansg »

Thanks, Mark for the reminder. Will adhere to this good guide.

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Re: Attached Image Size on Posts

Post by solarchat »

Bruce, thanks for the offer. The current attachment/database size on this forum is over 40GB...GIGAbytes. I am not aware of any way to share dropbox stored images automatically on this forum or how to have uploaded images sent to a dropbox. Since everyone already has at least 5GB of free storage space on dropbox, if there is a way to do that, please enlighten our users on how. :)

Just a note, the internet is incapable of displaying images over 72ppi and you are not getting any advantage by sharing a gigantic .tif vs a compressed jpg other than the ability to zoom in closer in the image and still maintain the 72ppi resolution without degradation.

I've always tried to have zero size or length restrictions on posts here and we rely on common sense that someone won't post a 300MB+ image, although there are many here...lol

Like I have noted many times before, we are way beyond the size limits that any of this software was designed to handle and we are also way past the allotted maximum database size for a forum on our host Network Solutions. I currently pay for 2 hosting packages in order to handle the size. This is not a normal setup and I have no idea if this forum will work tomorrow or the next day although it has done a pretty good job for almost a decade.

If you are using this forum as a repository for your images, I can guarantee that you will lose them at some point so maybe find a better way for storage.

We will just keep it going as long as it lasts and as long as the nonprofit is funded but I don't guarantee anything. :)

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Re: Attached Image Size on Posts

Post by rsfoto »

ust a note, the internet is incapable of displaying images over 72dpi and you are not getting any advantage by sharing a gigantic .tif vs a compressed jpg other than the ability to zoom in closer in the image and still maintain the 72dpi resolution without degradation.
Hi Stephen,

The resolution of an image in DPI is totally irrelevant. DPI is meant for printing and does not influence the size of an image displayed on a monitor.

An image of 1500 x 1000 pixels with 1 dpi setting or 500 dpi setting will always look the same on a monitor but if you go to your printer with that image the first image with 1 dpi setting will print out at a size of 1500" x 1000" (Huge Billboard) and in the second case it will print out like a postal stamp with a size of 3" x 2".

A big problem is the difference between uploading an image here in *.png or *.bmp format compared to a *.jpg image.

A 100% JPG image is about 2 or 3 times smaller then the same image in PNG format, Same applies for a BMP image. In no case you will see a better image using PNG or BMP compared to the same image in JPG format.

BTW, a monitor's resolution in dpi can be calculated by dividing one measurement, be it vertical or horizontal. e.g. my monitors have 597 mm horizontal size and display 2560 pixels and so my monitor dpi is ~109.

Again dpi is meaningless when presenting an image on a Monitor as monitors display pixel by pixel and do not care about dpi.

dpi means dots per inch or drops per inch. When printing an image profesionally the printers want from you 300 dpi for a good resolution in the printing. If you would deliver an image with 25.4 dpi then ead ink drop would have the size of 1mm and the printing result would be awful.

Also when printing a book, or a calendar the offset printer want to have 300 dpi due to quality reasons.

Below the same image, one time at 1 dpi at 2108x2104 pixels and then at 500 dpi at 2108 x 2104 pixels. Both images at no JPG compression e.g. 100% have 978 kb and the same image saved as PNG has 2097 kb and looking at the image you see no quality difference at all


Rainer_BN_20210226_1dpi.jpg
Rainer_BN_20210226_1dpi.jpg (977.81 KiB) Viewed 1157 times
Rainer_BN_20210226_500dpi.jpg
Rainer_BN_20210226_500dpi.jpg (977.81 KiB) Viewed 1157 times
Rainer_BN_20210226.png
Rainer_BN_20210226.png (2.05 MiB) Viewed 1157 times


regards Rainer

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Re: Attached Image Size on Posts

Post by DeepSolar64 »

I always thought DPI applied to printers only also. Good point Rainer. Pixel count and file type should be more relevant to file size. I try to use .jpg files whenever possible. TIFF, .png and .bmp files tend to be too big.

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Re: Attached Image Size on Posts

Post by solarchat »

my bad. I meant PPI, not dpi. Ill edit it.


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Re: Attached Image Size on Posts

Post by EGRAY_OBSERVATORY »

Yes, I agree with Rainer's definitions, whilst ultimately, it is the size of the images in either Kb's or Mb's - as sent over the internet and subsequently recorded on the server/hosting environment which will affect the cost of paying for that hosting..

Of course whilst TIFF's/PNG's etc., may well show a tad more detail on a user's own screen (prior to internet-transmission), reducing the ultimate-size to JPEG compression and saving the Mb's for transmission to SolarChat, does not make a significant amount of difference to the image-quality for the end-users/us - to see, which really does apply to Solar-imagery.

I have done some work with this type of scenario in the past, where I was getting images of several Megabytes of an image of aircraft as being received as a TIFF or even a RAW format. I reduced such images to JPEG and sent them back to the sender, where it was agreed that only a small degradation was found against the original image and not enough to use such large amounts of internet-usage (including my own storage-space on one of my own computers)...

Regards
Terry


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Re: Attached Image Size on Posts

Post by EGRAY_OBSERVATORY »

Hey Stephen, wasn't "PPI" to do with radar-screens as a "Plan Position Indicator" of many years ago ?
Now it get confusing to me at least... !!!

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Re: Attached Image Size on Posts

Post by solarchat »

he he. pixels per inch


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Re: Attached Image Size on Posts

Post by solarchat »

I just did some maintenance on the forum and found over half a gigabyte of orphaned image attachments in the forum storage folders. These are images that were uploaded but never posted for whatever reason.
Here are the stats after a massive cleanup.



36A03411-13FC-4D87-93FB-BB13D7620C1F.jpeg
36A03411-13FC-4D87-93FB-BB13D7620C1F.jpeg (148.19 KiB) Viewed 1134 times
34F1270A-5274-4B68-802D-A99C8FA29645.png
34F1270A-5274-4B68-802D-A99C8FA29645.png (1.31 MiB) Viewed 1134 times
25E612B7-8EC6-4B8B-817E-DF4B376F0914.png
25E612B7-8EC6-4B8B-817E-DF4B376F0914.png (1.35 MiB) Viewed 1134 times


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Re: Attached Image Size on Posts

Post by Stardust5858 »

Noted, will post jpeg in future. Thanks for your continued support and input.


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Re: Attached Image Size on Posts

Post by EGRAY_OBSERVATORY »

Yeah, we both know Stephen, but I called them "pixels" as "Dots Per Inch" Oh dear! Confuscious Say !!
+++
Re: Attached Image Size on Posts
Unread post by solarchat » Sat Apr 24, 2021 1:37 pm

he he. pixels per inch


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+++
Hey Stephen, wasn't "PPI" to do with radar-screens as a "Plan Position Indicator" of many years ago ?
Now it get confusing to me at least... !!!

Regards
Terry


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Re: Attached Image Size on Posts

Post by rsfoto »

solarchat wrote: Sat Apr 24, 2021 12:25 pm my bad. I meant PPI, not dpi. Ill edit it.
Hi Stephen,

It is the same. Be it PPI or DPI does not matter when presenting images.

Just think about it. The PPI of your monitor is fixed and not variable as the PPI or DPI of a printer.

What matters is the size of the image in pixels and the compression you apply in JPG.

There has been a lot of urban myths around all this due to marketing in the same way as people thought that a 100mm lens converts in a 160 mm lens due to the misunderstood crop factor ... OFF TOPIC :lol: :lol: :lol:

The same still applies when people say my monitor resolution is 2560 x 1440 pixels ...but OK also OFF TOPIC


regards Rainer

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Re: Attached Image Size on Posts

Post by EGRAY_OBSERVATORY »

Nicely put Rainer !
LOL
Regards
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Re: Attached Image Size on Posts

Post by pedro »

I always use links from my webpage or FLICKR. It's the best practice


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Re: Attached Image Size on Posts

Post by DeepSolar64 »

Would DropBox links work?


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Re: Attached Image Size on Posts

Post by marktownley »

DeepSolar64 wrote: Sat Apr 24, 2021 11:54 pm Would DropBox links work?
Dunno, try it I guess...


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Re: Attached Image Size on Posts

Post by DJD »

OK, so I have put an image on Flickr a copy of which was attached to a recent post of mine as an experiment.
I then edited my Solar chat post to add a link to the original image.
Then it occurred to me that if there is not some form of thumbnail that links to the external image it would be
less than inviting.
It seems stupid to upload an image to Solarchat and have an external link, so what is the best way for viewers
to get a preview of the full size image ?
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Re: Attached Image Size on Posts

Post by Montana »

In Flickr click here where the red arrow is
Flickr 01.PNG
Flickr 01.PNG (1.27 MiB) Viewed 1069 times
Then click 'large' or 'original' for an animation.
Flickr 02.PNG
Flickr 02.PNG (187.7 KiB) Viewed 1069 times
Copy the BB code and paste it into your message box.

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Re: Attached Image Size on Posts

Post by DJD »

Thanks Alexandra, but not quite what I was looking for ( unless I was doing it wrong )..
You can also just right click on a Flickr image and copy and paste the URL straight into the SolarChat post, but
that just shows as a clickable link on SolarChat.
I wanted somehow to have a visible image/thumbnail of the image that went to Flickr when you clicked on it.
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Re: Attached Image Size on Posts

Post by Bruce G »

solarchat wrote: Sat Apr 24, 2021 12:13 am Bruce, thanks for the offer. The current attachment/database size on this forum is over 40GB...GIGAbytes. I am not aware of any way to share dropbox stored images automatically on this forum or how to have uploaded images sent to a dropbox. Since everyone already has at least 5GB of free storage space on dropbox, if there is a way to do that, please enlighten our users on how. :)
I was proposing only that I would finance the Dropbox. Solarchat or CBSAP would be the owner. In other words, I would make a donation and an admin here would manage the Dropbox account. But I don't know how to link images to here from Dropbox either or if it's even possible. My concern was more about sharing captures. A single video file from my QHY163 is often 32GB. We don't want to put something like that on this site. So I guess we're talking about different purposes - limiting the size of images that you want to show to the whole group vs. allowing the sharing of large files between individuals or a few members.

Bruce G


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