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Canon CR3 Raw file format

AY2007 發表於 2018-4-11 15:11:50 | 顯示全部樓層 |閱讀模式
File 細30-40%, 又冇留意到既分別. 咁正?

https://www.dpreview.com/article ... mpressed-raw-format

The EOS M50 may be aimed at beginning photographers, but its all-new Digic 8 processor makes it Canon's first camera to use the CR3 Raw file format. Older Canons that used the CR2 file format could capture either losslessly compressed Raw files or 'medium' and 'small' equivalents, both saving you disk space, the latter at the expense of reducing resolution.
However, if you enable the compact 'C-Raw' option on the M50, the files will be 30-40% smaller than their losslessly compressed equivalents without any reduction in resolution.

Smooth gradients can often trip up compression algorithms, particularly in many cameras' JPEG engines, so we wanted to see if there was any noticeable difference when the EOS M50 compresses its Raw files. As with our un-pushed studio images, it's again impossible to tell which is the normal Raw file, and which is the C-Raw file. So what does this all mean?

At this time, we're optimistic that users of Canon's new Raw format can shoot in C-Raw without a noticeable impact on image quality.



黑星 發表於 2018-4-11 16:23:55 來自手機 | 顯示全部樓層
本帖最後由 黑星 於 2018-4-11 04:26 PM 編輯

CRaw 是比Raw 弱少少,除非後製上要好極端,否則是看不到那些分別,以一般應用上,CRaw 都足夠使用。某程度上說,canon 在file壓縮上是有進步了,對於不要執相、或大幅後製的用家,但又想留Raw 作存,就是個大好的file format
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韋士利 發表於 2018-4-11 17:11:03 | 顯示全部樓層
本帖最後由 韋士利 於 2018-4-11 05:17 PM 編輯

如果能透過FW update可以令多D相機用到就好(canon 未必會咁做) 不過首先要測清楚performance (開RAW, RAW->JPEG) 相信DPP都需要時間去fine tune
anyway, 有新format 係好事 CR2 用左咁耐係時候再進一步用CR3
p.s. RAW / JPEG 我都有儲存 NAS +幾隻TB唔算貴 裝家庭相每五至七年先換一set 都OK
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