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Also, I’m working on some pictures. Having trouble with the 256k limit, passing between Samsung phone and ipad, etc. I’ll get it in a little bit. I think.
You may know these, but three things that I look to for managing image size: 1) Compression, 2) Cropping and 3) Pixels.
Compression: For posting photos online, I pretty much only use JPGs. Compression ratio affects the amount of image quality loss and image file size. Compression is typically set in your camera, but some editing programs can modify it also.
Cropping: I often take photos back a ways with a lot more image around what I'm interested in and then crop in my editing software to focus on just what I want. I do this, as often, getting too close blocks light or depth of field isn't as great as I want.
Pixels: There are only so many pixels that most computer screens can display effectively. 640 is the maximum pixel width or height that I try to use. Online viewing cannot really make use of many pixels over this, I've heard, and I believe it. Depending on cropping, the pixels in the other dimension may be as much as 640, but for most I use 480, but I set the greater dimension at 640 and let the software determine the other one.
Most decent image editing software lets you manipulate these. I can but do not like manipulating things on my phone. Instead, I send them to my computer and do the editing there. The one exception is rotation. I was having trouble with images that I rotated in my computer not showing up as rotated once posted online. They viewed fine on my computer. So, not, before sending images from my phone to my computer, I check to be sure they are rotated and if not, I do the rotation on my phone first. That has solved the problem. I do not know what sorts of image editing software is available for the iPad. I have one, but don't use it for image editing.
Rick