icekaolb wrote:
照你說法,你的同一套...(恕刪)
也不是這麽說
DxO是要以機械快門為準來測試
那就要把GM1設成機械快門來比,這樣才叫同一標準
現在的做法反而是讓GM1的量測基礎和大家不一樣了
除去GM1這個case,
DxO測試目的是要精準反映感光元件的表現, 如果有新技術造成無法反映
DxO要做的應該是使用新方法除掉新技術造成的影響, 抽絲剝繭以逼近感光元件的正確表現
而不是墨守成規止使用老方法, 這樣只會得到不正確的測試結果
mywang wrote:
http://www.dxomark.com/About/In-depth-measurements/Measuring-sensors-using-RAW-and-testing-lenses-on-cameras
有加料的RAW會試圖還原成原始資料,沒辦法的在評測中會標註提醒使用者
"Pre-cooked" RAW?
Certain manufacturers embed a small part of the processing directly in the sensor, which means that some degree of processing occurs before the RAW image is sent to the RAW converter. In this case, measurements for these "pre-cooked" RAW images can be biased by this processing.
To avoid any potential impact on our measurements, DxOMark always tests all cameras to detect any pre-processing of RAW images. A processed or pre-cooked RAW image has different characteristics from a genuinely unprocessed image. To some extent, these characteristics enable us to walk back the processing and reconstruct the original image to perform unbiased measurements, and we always inform the user about models with embedded pre-processing