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[EMAIL PROTECTED] wrote:
If I generate say a 800 x 800 pixel image in a program, it is just that. It has no size in the file. It has no business being assigned a size in any image header.
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If I submit it to a publisher for a paper, they will decide how big to print it (usually too small in my experience). All they need is sufficient detail that they can degrade it to their preference.
That, in my opinion, is how it should be. But if you visit the publisher's website you see thay have very specific instructions about what resolution required for what type of figures. Not how many pixels, but what resolution. I have visions of some junior technician opening my file in photoshop, seeing "resolution 72 dpi"- The next morning I get an email from the publisher to upload the figures again following the posted instructions. So I always "convert" to the desired resolution even if it is only changing some unimportant value in the header. But seriously, it makes sense to give the publisher some clue what size the figure should be. Presumably there is some back-and-forth between the editorial office and the publisher about the layout. But at the initial check of your uploaded files, if photoshop says the image is 8x11 and 72 ppi resolution, for all they know it may be a full page illustration. In that case the resolution is inadequate. If you know the figure will be one column-width and 300 ppi, why not put that information in the figure? Ed PS- The option to resample in photoshop (under Image:image size) has gone through at least three different versions, apparently in an attempt to make it more intuitive. The first photoshop (e.g. version 2.5.1 running in a mac emulator on my linux box) has a check box "constrain file size" meaning do not resample. Then if I recall correctly they tried a check box "resize image" meaning to not resample but let the image size change when you change the resolution (i.e. nothing changes but the value in the header). Now the check box is "resample image" with just the oposite meaning. If you want to keep your original pixels you check "constrain file size" or "resize image" or uncheck "resample image" depending which version you have. If the level of detail is OK and you just want to increase the number of pixels to satisfy some silly publisher's requirement, do the opposite.
