نوشته اصلی توسط
amingol
با سلام خدمت دوستان عزیز
من در شرف خرید دوربین كنون اس تو آی اس هستم و این سوال رو داشتم كه آیا كیفیت عكسهای این دوربین برای چاپ در ابعاد A4 مناسب هست یا نه در رابطه با این دوربین كه مطالعه كردم اكثر سایتها متفق القول گفته اند كه این دروبین یك مقدار نویز بیشتر از سونی اچ 1 داره !!
حالا آیا این مقدار نویز تاثیری تو چاپ عكس در ابعاد A4 میذاره یا نه ؟؟؟؟ ممنون میشم كه قیمت مموری 1 گیگ برای این دوربین بهم بگین
.
متشكرم.
دوست عزیز برای چاپ A4 با این دوربین مشکلی نخواهید داشت به متن زیر از کتاب Mastering Digital Printing کنید
So what is the best file or image resolution for digital printing? There is no standard ruleof-thumb for all digital devices as there is with commercial offset lithography. There, it’s well accepted that the ppi-to-lpi ratio (lpi is the “screen frequency”), which is also called the “halftone factor,” should be somewhere between 1.5 and 2.0. In other words, if you have an image that will be printed as a poster by a commercial print shop, the normal screen frequency would be 150 lpi. Multiply that by 1.5, and you get 225 ppi. Substitute 2.0, and you get 300 ppi. So your best image resolution in this example of commercial offset printing is usually between 225–300 ppi at final print size.
However, with most high-quality digital processes, there is no “lpi” in the same sense as with offset. In the early days of inkjets, some people used the 1/3 Rule: Take the highest resolution of the printer and divide by 3. For example, an older Epson inkjet printer with a 720 maximum resolution would require a 240 ppi file for optimal results (the “Magic Resolution Number”). But then Epson printhead-based printers started coming out with 1440, then 2880, and now 5760 resolutions. One-third of 5760 is 1920 ppi, an absurdly high and unnecessary image resolution. Some photographers and artists still swear by the 240-ppi formula for even the latest models of desktop printers, claiming, correctly, that, for desktop Epsons, the “native driver resolution” is still 720, so the 1/3 Rule remains in effect. (According to Epson data, the “input resolution”—the resolution that data is rasterized at—is 720 “dpi” for desktops and 360 “dpi” for wide formats.) However, Epson now recommends 300–360 ppi at the size you intend to print as their current Magic Number; if you get below 240 you may start to see a difference in image quality, and conversely, you won’t see any improvement with bitmapped images by going over 360 ppi.
(Note: unlike bitmaps, vector art is “resolution-independent,” which means that you can
blow it up or down without any loss of definition or clarity.)
Hewlett-Packard (HP) has an “internal render resolution” of either 600 dpi or 1200 dpi,
depending on the quality setting, and they recommend 150–200 ppi (or even up to 300
ppi) at final size for their inkjet printers. (HP likes to call it “pixels per printed inch” or
PPPI.) They claim that scientists doing satellite photo reproduction for the government
on their printers typically find that 125 ppi is adequate. In my own experience, 200 ppi
is a good image resolution target for most HP inkjet printers.
Canon, also with a native printhead resolution of 600 dpi on many of its inkjets, says that an image must be greater than 180 ppi “to avoid pixelation that shows as staggering in contrast points.” They go on to recommend 200 ppi (see Table 2.1) as the target with 300 ppi as the maximum needed for their inkjets. (To see what printheads look like, go to the “Inkjet” section near the end of this chapter.)
For continuous-tone printers that don’t use halftoning or dithering (explained below), try
to have your image resolution match the printer resolution. Most dye sublimation printers are around 300 dpi, so make your final image also 300 ppi. Same for LightJets and
Table 2.1 The Magic Numbers of Inkjet File Resolution
Brand Manufacturer’s PPI Recommendation at Final Size
Canon 200–300 ppi
Epson 300–360 ppi
HP 150–200–300 ppi
Lambdas, which are, respectively, 300 dpi and 400 dpi at their maximum settings; an
image resolution of 300 ppi should work well for them, too.
Chances are that if you are anywhere between 240 to 360 ppi in terms of image resolution at final print size, you’re going to be fine with most digital print devices, although the best answer is to either test several resolutions with the intended output device and evaluate the resulting prints, or ask a printmaker for recommendations if you’re using an outside printing service.
همانطور که مشاهده میکنید وجود 300ppi برای چاپ حالت ایده ال است و برای این دوربین در سایز A4 تقریبا 225ppi
وجود دارد که برای چاپ در این سایز با توجه نظرات سازندگان چاپگرها مناسب است لیکن بهترین نتیجه در آزمایش عملی بدست می اید من خودم تا به حال در این اندازه چاپ نکرده ام ولی تصمیم به اینکار دارم از نتیجه شما مطلع خواهم کرد
در ضمن من خودم یک ممو ری کارت 1گیگ خریدم البته حدود تیر ماه با سرعت 60 70000 تومان
در ضمن برای جلوگیری از مشکل نویز که مشکل عمومی دوربینهای با سنسورهای compact است بایستی سعی شود در نور مناسب و حساسیتهای پایینتر عکسبرداری شود