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FORVM`s Classical Numismatics Discussion Board  |  Announcements and Help  |  Discussion Board and FORVM Website Help (Moderators: Joe Sermarini, Sorin)  |  Topic: Enlarge pics in postings 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Enlarge pics in postings  (Read 1450 times)
mauseus
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« on: March 06, 2010, 08:45:43 am »

Hi,

May have missed it somewhere but Maridvnvm and Slokind both post images in posts that can be clicked and enlarged. Could somebody share with me how to do this please.

Regards,

Mauseus
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goldenancients
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« Reply #1 on: March 06, 2010, 08:54:43 am »

I'm pretty sure that if you post a picture larger than the size allowed, that it will automatically be resized on the post and allow enlargement by clicking.

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Danny
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Aarmale
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« Reply #2 on: March 06, 2010, 11:16:37 am »

Correct. Ususally, the website resisizes it.  If it's bigger, you are able to click it, and, depending on size, the coin will either just turn bigger or turn bigger in a new window.
For example, I have posted my Aristobulus prutah.  Because the original image is not a bit bigger, but significantly bigger, the original sized photograph will open in a new window.

-Aarmale
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mauseus
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« Reply #3 on: March 06, 2010, 01:34:23 pm »

Hi,

Thank-you for your replies.

Regards,

Mauseus
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slokind
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« Reply #4 on: March 06, 2010, 01:38:17 pm »

Run the mouse over the image.  If you see the arrow, the image is as big as the sender sent it.  If you see a hand, click ON THE PICTURE itself.  If then you see a reading-glass icon with a + in it, you should click on the picture again, and the image will be a bit larger AND BEST POSSIBLE DEFINITION, and you will see a - on that icon.
I usually send images now reduced to 1000 pixels across, in the case of an obv and rev pair or other 'landscape' image, and that means that one click is not exactly how it was saved, whereas, with the second click, it is.
Needless to say, if I send an image of a standing statue I'll send it at ~680 high, and that's plenty big enough as it is.
I usually initial the 1000-pixel image files "K-" for kilo.  And I jpeg them to Photoshop's level 9 out of consideration for those who still have copper-wire and modem connections.
See the two Marcianopolis coins, newly photographed, that I just (last night) posted on the Marcianopolis Addenda in Provincial.
Pat L.
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PtolemAE
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« Reply #5 on: March 07, 2010, 12:37:11 am »

Smart web sites display images using HTML codes that automatically limit the basic display to a certain size.  The 'size limiting' helps the pictures appear at some reasonable size within a web page but it doesn't limit your ability to see it 'full size' if you click on it to isolate it from the web page sizing codes.  If the picture is actually larger than the size it appears on the smart web page then you can click on it to see it larger (which disconnects the picture from the size-limiting codes).  The size-limiting codes turn the picture into a kind of 'thumbnail' you can see but which you also can click on to see fully enlarged.

For those who upload large images, even JPEG'd, the coded 'size limiting' doesn't reduce the image loading time when the browser gets to it.  The whole image (whatever its file size actually is) still loads in and, in general, it takes longer for bigger pictures.  IOW if a picture is actually 1000x1000 pixels it may take a while to load even if the web page is 'coded' to show it as 200x200 pixels.  But when you click on the 200x200 version the big version will appear immediately because it's actually already loaded into your browser.

A workable rule of thumb for uploading coin pictures is about 250 pixels per centimeter of the coin's size.  IOW, if you have a 4 centimeter (diameter) coin then a picture of 1000 (x 1000) pixels may be needed to see it clearly.  It's just a rule of thumb.  If your smaller coin has fine details only visible in a greatly enlarged view then a high pixel count may also be justified.  For the average coin ID, 250 pixels per centimeter should be plenty if the photo is sharp and decently lit.  If you have a 1000 x 1000 picture of a small coin you can use your graphics program (IrFan, etc.) to cut it down to 250x250 and upload the smaller pic.  That reduction alone will cut the image-load time by a factor of 16.  And JPEG (even at 90% 'Q' level) will reduce the file size a lot more while leaving most of the detail intact - small files help phone-modem visitors (and everyone else, too Smiley.  Picking a good pixel size and JPEG quality is just good netiquette.  You can easily reduce image-load time for those who view the picture by a factor of 50-100 overall, compared to uploading a PNG or BMP image that is unnecessarily bloated.

PtolemAE

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slokind
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« Reply #6 on: March 07, 2010, 01:48:43 am »

Those are good mechanical rules of thumb, yes.  And, obviously, one does make a special reduced file for posting.  Always.  My largest ones, when condition or any other special requirement demand it (and my old eyes wish that others would do so, too) are my "K-" files, 1000 pixels wide.
P.L.
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moonmoth
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« Reply #7 on: March 07, 2010, 02:12:30 am »

With the increase in pixel width of modern screens, I have started to use image files that are 1200 pixels wide.  When I prepare a pic specifically for upload, I use JPEG quality 4. This might seem low, but it looks fine on screen and saves a lot of bandwidth. 

Also, when I put smaller pics on my web pages, I remove all the metadata, which cuts their size to half or less. So a page with a lot of small pictures loads faster than it would otherwise. The improvement is even greater where there are many, much smaller pics, like this page:

http://www.forumancientcoins.com/moonmoth/glossary.html

However, when posting here, I often use the pics I have for my home use, which are higher quality and still include metadata.

Bill
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