Quote:
Originally Posted by DaleDe
As pdurrant says ignore ppi when determining the picture size. Use pixels to determine the size you want for the image. For most eBook readers anything over about 1024 pixels wide is overkill for the purpose of displaying images. Most eBook readers will not let you zoom an image so you are restricted to viewing it with the number of pixels on the screen. Figure out the target devices and set the image sizes appropriately. Setting a bit bigger will allow for future high resolution devices but I would worry more about the sizes of the image that a super high resolution that the reader will never notice.
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I'd be very interested to hear a discussion (seriously) on what the difference is, in this day and age, screen-wise, between ppi (particularly in a program like Photoshop, which uses actual pixels, not print output) and "pixels." In the old days, we had DPI for print, which did have an effect on the outcome resolution. Now, though, we are discussing images in ebooks, which by definition are being displayed on a screen. Obviously, the screen does not change when it encounters an image with a rez different than its own; the difference in "resolution" is simply how many pixels you put in the total area of the image, and thus, how much the eye-brain interprets, creates and extrapolates. How is that really distinguished--differentiated--rom PPI? How does one exist without the other?
I don't see how, in other words, when someone says, "use pixels," that that exists separate and apart from PPI. You calculate the image size you need based on the device, if you are making a book strictly for one device. If you're not, you're guesstimating, and at that point, you say, well, the average reading device is ~3.5" wide, and thus, this image will be somewhere between X and Y, X being (for example, 75ppi) one figure for width and Y being the greater if you're thinking 96 or higher. No?
Hitch