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render resolution question

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Steve:
Alpha2: I wasn't even aware that there was an inherent pixel/inch metric built into those formats, so obviously I didn't add any option to Anim8or to set it.  I'll look into the libraries that I use for .JPG and .PNG and see what I can do. Anim8or just renders pixels :)

cooldude234:
To be honest depending on the printer (the people doing the printing not the machines themselves) you can usually just state what dpi your image is in and send them the image data in a format they accept and they usually will be fine with that. And printing for something like a comic book can get pretty complicated with having to deal with things like bleed margins and stuff. But it really depends on who's doing the printing because there are many different ways to go about it and some companies will only except certain things.
My best advice is ask if they want the dpi included inside the image file.

ENSONIQ5:
254 on BMPs is probably derived from the number of 10ths of a millimetre in an inch (25.4mm).  ie. 254dpi = 10dpmm.

Alpha2:
@cooldude234 Yeah, some printers can throw you for a loop with their requirements, I've been working in book production for a while and I'm still amazed what they can hit you with. The general rule I get from most of the printers I've dealt with is 300 dpi minimum for print comics in CMYK (I believe that's for offset if I'm not mistaken), there are some printers that accept RGB for direct digital printing now (Print on Demand places like Ka-Blam are usually okay with it) but they still suggest 300 pixels per inch. For printing on shirts, sweaters, etc. they may go as low as 150dpi, but only because their inks run a little naturally.

@Steve Thanks for looking into it!

ENSONIQ5:
To my way of thinking (with minimal print experience) there's two ways to define the resolution of an image:

1) Specifying the size of the image (in mm or inches) and specifying a DPI resolution; or
2) Specifying the number of pixels in the X and Y dimensions.

The DPI figure is of no value if referring to the image by it's X/Y pixels, it will be determined by the printed/displayed size of the image (ie. DPI = X/W where X is the width of the image in pixels and W is the width in inches).  Conversely, a printer requesting a certain DPI makes sense only if the printed size of the image is known, so if you need a 5 X 8 printed image and the printer needs 300DPI you'd need to render an image 1500 x 2400px.  Or am I missing something?

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