Managing large photos

To: "" <>
Subject: Managing large photos
From: Nick Payne <>
Date: Sat, 18 Apr 2020 09:22:27 +0000
If you use Thunderbird as an email client, there's an add-on you can
install called Shrunked Image Resizer, which will do the resizing from
within your email once you have attached the image to it. For instance,
this juvenile Koel image was 5.4Mb when attached, and it took me a
couple of seconds to reduce it from within the email - I just
right-clicked on the attachment and selected "Resize this image".

I would presume that other email clients would have something similar.


On 18/04/2020 5:01 pm, David McDonald (personal) wrote:
> Greetings. As you know, the maximum size of an email sent to this list
> is 200 kb, including the text of the email and any attachments.
> It has been suggested to me that I re-post advice on how to resize
> photos so that they are small enough to be posted to this list.
> I use the free, highly-regarded, image manipulation software Irfanview
> . Download the 64-bit version if you are
> using Windows 10, and see the option to resize/resample in the 'Image'
> menu item.
> Another good approach is to simply upload your image to an online
> location such as OneDrive, Dropbox, iCloud, Google Photos, etc. Simply
> copy the location of the photo and paste it into your email. You
> usually do this (after uploading the image) by right-clicking on the
> image and selecting the option that says something like 'Copy link
> location'. Taking this approach means that you do not need to resize
> the photo: people clicking on the link you provide get the photo in
> its full size.
> Some years ago, Geoffrey Dabb posted the following guidelines on
> resizing, etc., which you may find useful.
> Best wishes - David
> --
> David McDonald
> Canberra Ornithologists Group email lists manager
> 1004 Norton Road, Wamboin, NSW 2620, Australia
> Tel: (02) 6238 3706 | Mobile: 0416 231 890
> E-mail: 
> The following points may assist in reducing the size of bird photos:
> • A picture simply transferred from digital camera memory or a scanner
> will usually be too large to email but can be edited by a simple
> graphics program (the kind supplied with many digital cameras) to
> produce a ‘jpeg’ image of appropriate size.
> • ‘Editing’ in this sense need not affect the original image, but
> involves producing an additional version that is suitable for emailing.
> • Reduce the amount of information in the image by cropping it to show
> only relevant detail eg in most cases just the bird will be
> sufficient, with minimum background. This will probably also reduce
> the dimensions of the image.
> • Further reduce the dimensions of the image (by using ‘resize’ or
> ‘save as’ options). Dimensions might be expressed in cms, inches or
> pixels. A pixel size of 300x200 that is ‘mainly bird’ will generally
> be large enough in most cases for viewing on a monitor, even though it
> might not enlarge or print with good quality. A jpeg image more than
> 600 wide might be too big for convenient viewing on the monitor at the
> receiving end.
> • The two above steps will generally achieve an image of less
> than.100kb. If the file-size is still too big, consider reducing the
> resolution of the image. How this is done will depend on the editing
> program, but it might be achieved by applying a degree of
> ‘compression’, by selecting a standard such as ‘medium’ or ‘low’
> rather than ‘high’, by reducing the pixels per inch or centimetre, or
> by using some other resolution scale however expressed. Sometimes when
> an image is ‘saved’ or ‘saved as’ this will of itself alter the size
> of the file – either up or down.
> • At the stage of sending the image, your program might give you an
> opportunity to specify the dimensions for sending eg ‘actual size’,
> ‘full screen’, ‘quarter screen’ and/or at a specified width in pixels.
> This is another way of controlling dimensions, that can be used
> instead of or additionally to that indicated above.
> If you have not had much experience in editing and emailing photos,
> you may wish to experiment. You can discard the results – and your
> original image need not be affected, although you may wish to make a
> copy to work on as a precaution. You can also practise by emailing an
> image to yourself to see how it will look, and how large it is, when
> received.
> When replying to or commenting on messages with pics, take care not to
> resend the pic unnecessarily. This can easily be overlooked if the pic
> is embedded in the original message rather than an attachment. If your
> reply settings do not automatically delete the pic, you will need to
> do this manually.


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