JP1 發表於 2020-5-9 22:07
輸入的影像，如果係1080p/1080i，電視尺吋係75吋/65吋/55吋，影像會唔會模糊？ 例如玩Nintendo switch 和 ...
已經講咗：當年NHK 就係甪三倍高度距離呢個準則嚟到開發1125線，1080P當然冇問題啦，以下係部份文件
以樓主嘅視聽距離
以可負擔嘅價錢計
我寧願低一級嘅75吋
都唔要高一級嘅65吋
最佳是 77", 特別是睇戲.
其實數據還數據，好似聲音咁，係米一條平直線代表好聲?或者咁講係米岩自己既聲音?好多時最老套最戴頭盔既說話就係“耳聽為實”.
其實樓主不如簡單D，拎把拉尺去百X匯or豐澤，拉2.9m既長度之後企係把尺後面，55又好65又好75都好，試晒D size, 應為邊個size適合自己米買咩size.(我自己係咁做)
揀定size,再上來請教下D師兄咩牌子咩型號好米重實際
(btw我個人意見，電視係會越睇越覺得佢細部)
HUMAN EYESIGHT & 4K VIEWING
https://www.red.com/red-101/eyesight-4k-resolution-viewing
HUMAN EYESIGHT & 4K VIEWING
Resolution has been advancing continuously since the early days of analog television. The latest incarnation is 4K displays, but even higher resolution devices are possible. In this article, we take a closer look at the science of visual acuity, along with when higher resolutions are beneficial to the viewing experience.BACKGROUNDOur perception of detail depends not only on the smallest features in a subject, but also on the distance at which these features are observed. Human vision is therefore typically described in terms of angular resolution:
https://s3.amazonaws.com/red_3/uploads/asset_image/image/51c0df7526465a045e000dd8/intro1.png
Being able to resolve lines in characters that are separated by one sixtieth of a degree (an "arc minute") is the goal when testing eyesight. Since this resolution is typically assessed using an eye chart at a distance of 20 feet; this level of performance is defined as 20/20 vision. Similarly, 20/50 means one can only resolve detail that someone with 20/20 vision could resolve from 50 feet away. Alternatively, with the metric system these are all standardized around 6 meters and referred to as 6/6 vision instead.
https://s3.amazonaws.com/red_3/uploads/asset_image/image/51b9099c17ef0278ff0005e8/snellen-eye-chart1.png
Although 20/20 is a reasonable capability for someone with good eyesight, this is by no means a limit. Each viewer fits in differently amongst the full spectrum of visual capabilities. Someone with healthy eyes or glasses may actually resolve substantially more. Furthermore, the visual capabilities required for discerning text are typically much higher than those required for perceiving additional detail.RESOLUTION VS VIEWING ANGLEWith photography, fine art prints typically use 300 pixels per inch, which requires a viewing distance of one foot for someone with 20/20 vision to resolve. However, pixels do not always have to be this densely packed. With enlargements, the standard rule of thumb is that these will be viewed at a distance similar to the diagonal print dimension. This causes the print to encompass an angle of view spanning about 50° in its longest dimension:
https://s3.amazonaws.com/red_3/uploads/asset_image/image/51b9295e26465a013a000106/intro2.png
Although these viewing angles are not always possible or practical, they are usually where someone will stand for an immersive viewing experience. At the same angle of view, one may therefore prefer being closer to a smaller screen, but farther from a larger one:
https://s3.amazonaws.com/red_3/uploads/asset_image/image/51f2c3d7a48c3732dc000266/viewing-distance1.pngSmaller Screen
(Closer Viewing)
https://s3.amazonaws.com/red_3/uploads/asset_image/image/51f2c3d7a48c3732bf000261/viewing-distance2.pngLarger Screen
(Further Viewing)
This is primarily because this angle closely matches the 40° to 60° central angle of view of our own eyes:https://s3.amazonaws.com/red_3/uploads/asset_image/image/51b90f6a17ef026eb2000cd4/angleview2.jpg
Filling this angle helps the viewer feel more as though they are within a scene as opposed to looking at it inside a rectangle. In effect, higher resolution enhances the sense of detail, whereas wider viewing angles enhance the sense of "being there." Both are needed to enhance the sense of realism.The key is that as the viewing angle increases, either due to a larger image or a closer viewing distance, the resolvable pixels also increases. Applying similar viewing angles to home cinema, high definition displays are typically out-resolved and can appear pixelated. 4K resolution is required to produce maximally sharp and seemingly continuous pixels for a majority of viewers:
https://s3.amazonaws.com/red_3/uploads/asset_image/image/51bb4c2da48c3746f800150b/plot1.png
The Health and Nutrition Examination Survey of 1972 demonstrated that 72.8 percent of the civilian non-institutionalized population 4 to 74 years of age in the United States has distance visual acuity of at least 20/20 in their better eye "with usual correction" (using glasses and other visual aids).
With theatrical display, relative viewing distances are often a little closer, depending on which seats are chosen. Widescreen aspect ratios may also be intended to extend into the viewer's peripheral vision. Seats near the middle to rear of most large-screen theaters create a 45° to 60° angle of view, but seats near the front can result in 90° or higher:https://s3.amazonaws.com/red_3/uploads/asset_image/image/51bb4ec8a48c375d0e0002d6/theater1.png
The diagram above depicts a typical large-screen theater with a 70 foot (21.3 meter) screen width. Although the IMAX, GSCA and other large-screen specifications recommend a minimum viewing distance of one screen width (53° viewing angle), the seating rows above extend out to a viewing angle of 45°. Even then, note how the majority of viewers can resolve more than 2K resolution from every seat in the theater.OTHER CONSIDERATIONSThere will always be some viewers or viewing conditions that mean a given pixel count is not fully resolved. However, this does not necessarily mean those pixels were wasted, nor that they were not beneficial. A pixel density just beyond resolvability is important to prevent individual pixels from becoming visible. Furthermore, displays and projectors with higher resolutions typically also render coarser details with higher contrast, and these details are resolvable.Regardless, imaging technology typically caters to optimal viewing, not necessarily to the least common denominator. When everything else is in place, display technology should maximize these conditions to ensure the highest fidelity possible. Tablets, notebooks, and smart phone continuously have higher resolution displays. Depicting more detail with cinema is a natural next step.In addition, high resolution content is only one of several factors contributing to our perception of detail. Cameras, lenses and focusing technique all need to meet a higher standard. Oversampled recordings are also helpful for making the most of a given pixel count. Only when all of these pieces are in place will the viewing experience have its maximal effect.
miipp 發表於 2020-5-12 10:39
最佳是 77", 特別是睇戲.
77選擇性及性價比遠遠低於75
如果睇電視65寸OK的話
睇戲多就一定要75
因為16:9播2.35:1
水瓜打狗上下無緊一截
MDLP 發表於 2020-5-12 12:43
77選擇性及性價比遠遠低於75
77" 代表 OLED ae
75" (LCD) 畫質遠遠遠遠低於 77" (OLED)
本帖最後由 5.1外星人 於 2020-5-12 16:26 編輯
如果睇電視65寸OK的話
睇戲多就一定要75
因為16:9播2.35:1
水瓜打狗上下無緊一截
21:9 TV不過己絕版
65比較好,但最重要4K 基本要求,唔好再用d過時1080p
