Hi all, Fernand and Thorsten. Yes, as you said, there are some professional fields that need the high-resolution image to do something like photo-album and magazine etc. I agree that it must and should reserve the original resolution. But I think that there are some other fields which should not hold it. Such as our customer who use Oo in the MID(Mobile Internet Device) which has only 1G CPU, 512MB DDR2 memory and 7" LCD with 800*600 resolution. The MID has low processing speed and low resolution. What the customer want to do is just using the Oo to show the Writer, the Impress etc. in the MID. They don't use Oo to do something like you. In this situation, why they should reserve the original resolution? Just keep not lower than 800*600 is ok for them. Even in your fields, because the image has so much various content, discarding some lines and columns is not a serious thing I think. Of course, keeping the origine is better. Maybe we can give the different customers some abundant options to dicide whether scaling image, which level they want to downscale the high-res image. 2009-01-15
sunyinan 发件人： Leonard Mada 发送时间： 2009-01-15 05:52:43 收件人： [email protected] 抄送： 主题： Re: [graphics-dev] [Impress] Information about improvingperformance Hi Thorsten, Thorsten Behrens wrote: > On Mon, Jan 12, 2009 at 03:03:02PM +0800, sunyinan wrote: > >> [...] >> > Hi sunyinan, > > I can't believe that a 1000*1000 image looks the same full-scaled on > a proper inkjet a4 or letter-sized printout. The recommended > size for a4 is 2362x3543 (for a 300DPI resolution) - and there *are* > people out there who (mis)use Impress as a photo album. > Lets take an A4: 11.7 x 8.3 in Lets take a colour image printed on a home-printer => it will have at most 100 LPI (actually more like 80-90). 11.7*100 = 1170 8.3 *100 = 830 So, a 1170 x 830 pixel colour image will print optimally on any home-printer. Lets take now a professional image-setter with 150 LPI: 11.7*150 = 1755 8.3 *150 = 1245 Any resolution higher than this is NOT useful, as the printer driver or printer processor will firstly scale down the image and then print it. In order to construct the various colours, the printer combines lots of dots, i.e. a 600 DPI will combine at least 6*6=36 dots to create 37 levels of gray (it is similar - though more complex - for colour prints). Thus, a 600 DPI printer will actually operate as a 100 LPI device (and usually lower than this, as a 85-90 LPI device). LPI is relevant, NOT pixels, but device manufacturers do NOT report the (TRUE) LPIs. Sincerely, Leonard > > >> If you agree with it, I think the next step is to find how and >> where to descale the high-res image. >> >> > When inserting it. You don't want to mess with existing documents, > at least not without asking the user. > > >> Maybe we can provide an option to let the user deciding whether >> saving the original size or not when he saving a file. >> >> > As pointed out above, definitely. > > Cheers, > > -- Thorsten --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
