You'll do better with three small shots than one big one usually.
Take a whole-plant distant shot, a close-up of a twig and leaves. and
one more of anything that seems distinctive about the plant right now.
Depending on season, you could add a shot of the flowers and/or fruit,
for example, or some plants are readily identified by bark/stem
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Don't you think that it would make better sense to ask the question at
Anyway, the larger the image size does not increase your chances of correct
ID. Its whether your image is clear and shows the proper characters for
identification, especially the flowers as well as the rest of the plant. An
image of a single leaf would be worthless for ID regardless of how large it
I realize this doesn't directly address your question, but if you have
a scanner, you can make *terrific* images of leaves and small flowers.
I've done this laying the items directly on the glass, but am now
thinking, in the interest of not having to clean it afterward, a clear
plastic sheet wouldn't significantly interfere with the scan.
As for image size (by number of bytes), for those of us with dial-up
connections, a 5Mb high-rez photo is an exercise in tedium. Many
photo-manipulation applications will allow you to use JPEG compression
to significantly reduce the number of bytes, with relatively little
loss of detail or color. Even the 'Paint' accessory program that comes
with Windows can 'resize' an overlarge image, although not in a
particularly sophisticated fashion.
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