Hòa tan cũng có thể chỉ ra sự khởi đầu của một chuỗi giấc mơ hay hồi tưởng. Mất dần và khăn lau tìm kiếm khá lỗi thời những ngày này, nhưng bạn không bao giờ biết khi nào một mắt tươi có thể làm cho một cái gì đó cũ cái nhìn mới. | Chapter 15 Color Correction 355 white. Note that this will change the contrast in your image but altered contrast will probably be better than flat solid highlights. And your highlights will now be legal for broadcast Figure . Remember to reactivate the clamping in your CODEC before you continue. Figure With a simple Curves adjustment you can manually roll off bright spots rather than clamping them. Luma Clamping Troubles If you are using a CODEC that clamps luminance you face another problem besides having your highlights reduced to flat blobs of white. Say you have a 4-second clip and you need to crop the frame to a smaller size during the last 2 seconds. The easiest way to do this would be to make a cut in the clip at the 2-second mark and then apply a crop filter to the second part of the clip. This cropping will cause your NLE to render new pixels for that clip which of course will require recompression using your chosen CODEC. Unfortunately if your CODEC performs luma clamping the second clip will 356 Digital Filmmaking Handbook now have very different luminance values than the first clip. Because the two clips are butted against each other this change in luminance will be very obvious and quite distracting. What can you do The best choice is to find a CODEC that lets you render unclamped video. If this is not an option either due to cost or availability then you need to get the computer to re-render both clips and possibly your entire movie so that every clip will be subject to the same clamping. If you apply a 1-pixel crop to each clip then the computer will be forced to rerender everything. Because your video is overscanned you ll never see this 1-pixel loss. Correcting Color If your project will eventually be transferred to film color correction in the for Film computer will be a bit of a problem. If you ve ever tried to print images on a color printer you ve probably discovered that what s on your screen doesn t al ways correspond to what .
