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It depends on the size, weight, number and destination
Presumably you are asking how many pictures with a single first class stamp, stamps come in many denominations to account for heavier packages. The number of pictures you can send with one stamp will all depend on the size and weight of the pictures. You will be able to send more wallet sized pictures than you will larger prints for the same price.
There have been many pictures on the $1 postage stamp. The most recent stamp pictures Scott Number 3766 shows 'Wisdom.'
One normal Canadian stamp (for a letter size and weight)
For a first class letter of one ounce, as many as it takes to add up to 98 cents of postage.
Stamp has only one syllable
A 1099 form, mailed in the required envelope, should be stamped with a regular first class, one ounce, stamp. As of 2014, a first-class stamp is $.49.
If you're mailing a letter that can be at most 50 grams, you should be able to include about 10 sheets of paper plus the envelope. Source: http://ansuz.sooke.bc.ca/professional/reference/paperweight.php
They are mailed from Virginia.
One 41 cent stamp for a letter of no more than 5 or 6 pages if it is mailed ANYWHERE in the US, until the rate goes up to 42 cents in May 2008.
From pe.usps.com they have pictures of the stamps. An H rate stamp with a HAT is worth 33 cents, and an H rateMAKE-UP stamp with a picture of a Rooster is worth 1 cent. Please look for yourself.
One option you can consider for printing pictures online is Walgreens.com. There, you can select a photo file from your computer and upload it directly to their site. Then, you can choose a size for your photo and choose whether you would like to pick it up at the store or have it mailed to you.