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------- Additional comments from [EMAIL PROTECTED] Sun Mar 16 19:19:31 +0000 2008 ------- > I'm afraid you display a distinct lack of understanding of what > an Office suite is used for. Sure an office suite user print documents. > But that's far from the only or even principal use. > Most office documents will never see preprint or even be printed at all > (in the impress case). So over-specializing the bitmap export for > print-oriented people like you is a bad idea. I have created lots of presentations myself and seen well over thousand during my life (though most in a competitor's program). ;-) A.) IF you don't print the document, why do you need PPI (or LPI or DPI)? It amazes me how users make simple things look complicated. IF the only thing the user does is to view the image onscreen, then pixels is everything he ever wanted (and color depth - much neglected, but even more important than resolution). This is the reason why I wrote (in brackets, its true) that the first step is to decide if the work is for print or onscreen viewing. Becuase for onscreen viewing we don't need dimension in inches (or mm, or something else) and we don't need PPIs either. So lets make it simple: give only resolution in pixels. On the other hand, IF the user decides that the work will be printed, than 2 completely different parameters become relevant: dimension in length-units (mm or inches, ...) and the targeted output resolution (LPI). This becomes a different story. B.) "DPI" for monitors > You forget that for a computer program a screen is an output device > and the dots of this output device are pixels. > > For a computer screen ppi = dpi While dpi is sometimes misused for monitors, you can't set a monitor "DPI" for your image, because for every monitor and monitor resolution, this is a different value. So, how do you assign a range of values to something. Indeed, what a complex question. I can view an image in 1024*768 and using your definition will get a specific value for "DPI", then change my graphics card resolution to 1200*1024, and voila, for the same image and monitor I get a different "DPI". ;-) [Just to confuse matters further, there are 0.25 mm dots pitch monitors, but this varies between 0.24 mm in very good monitors to 0.27 mm in poorer ones. Additionally, every user uses different monitor settings, and the "PPI" will vary greatly from 800*600 to 1600*1200 resolutions. So, my recommendation: just ignore the PPI whenever the work is intended solely for onscreen viewing.] C.) Just a short comment on color-depth: this much neglected feature is more important than resolution itself. This is why an image displayed on a 72 PPI monitor looks so much better than even if printed on a 1.200 DPI printer. In the RGB colorspace are some 16.8 million colours. Arguably, even a good monitor is not able to display all these colours (but neither the human eye can discern them all), but a printer's CMYK colorspace is greatly diminished in comparison even with a monitor. This issue becomes also important when editing images using various software. The Gimp was mentioned previously, unfortunately, it can handle only 24 bit-colors. This is relevant when performing image-processing in hingh end settings, where 8bit/channel does not suffice: 12 and 16-bit per channel is much better, because intermediate calculations might use values that exceed the possibilities of an 8 bit number. This is especially tragic with Gimp, because some years back, someone (or a corporation ? - forgot it) provided some patches to extend Gimps capabilities (I think to 16 bits per channel), but in one of the greatest shortsightednesses, the developers refused to implement them. So, when exporting a rasterised graphic, at least as important as the spatial resolution is also the colour resolution. When I teach image processing, I do some little experiments with students: take an image and reduce the spatial resolution vs reduce the colour resolution. You may see yourself what dramatic effects colour resolution has. --------------------------------------------------------------------- Please do not reply to this automatically generated notification from Issue Tracker. Please log onto the website and enter your comments. http://qa.openoffice.org/issue_handling/project_issues.html#notification --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
