糾正鏡頭的枕狀.失真.色差和暈影 Epaperpress PTLens 8.9

糾正鏡頭的枕狀.失真.色差和暈影 Epaperpress PTLens 8.9

PTLens是Windows軟體，糾正鏡頭的枕狀.失真，色差和暈影。
PTLens是作為一個獨立的應用程式或Photoshop外掛程式。
無論是獨立的應用程式和外掛程式版本的PTLens下運行Windows 2000或Windows XP的顯示器解析度至少為1024×768 DPI（96）。
該外掛程式在Photoshop版本6及以上所有版本的Photoshop Elements版本的作品。
雖然PTLens相容Paint Shop Pro的和Irfanview的，相機，型號，鏡頭，焦距必須手動特殊的，因為他們不提供EXIF訊息的外掛程式。

現代電腦通常具有包括一個以上的核心的處理器。
每個核心可以並行處理計算密集型任務
。為了提高效能，PTLens在您的系統上選取「工具」>「選項」（PC）或「偏好項」（Mac）和指定在您的系統上的執行緒數。

當只有校正失真小於1秒時，利用8個執行緒。指定正確數量的處理器效能提高了三個因素。
沒有任何的好處是獲得指定更多的不是支援你的架構的處理器。有沒有處罰，無論是作為額外的執行緒的開銷是最小的。

PTLens是第一個應用程式來自動失真校正。這一切都始於2002年8月20日，當我在新聞組發佈了以下的訊息：

我需要的是一個批處理程式，讀取EXIF訊息的JPEG
檔案，尋找表中最接近的符合，並自動校正
失真。
好了，我可以夢想，不是嗎​​？
沒有人自告奮勇，2002年9月19日，我發佈了1.0版本的PTLens。幾年和30000行原始碼後PTLens已經發展到一個易於使用的應用程式和Photoshop外掛程式，校正失真，暈影，色差和觀點從一個簡單的DOS指令行程式。作為一個開發者，我訂閱了Unix的哲學：寫程式，做一件事並把它做好。
「表」，在上述報價，內含2400多單獨的校準 – 遠遠超過任何其他應用程式。站台DPREVIEW已經相比PTLens的DxO和Photoshop CS2（因為我已經改進的漸暈）。
檢視在數字內陸的照片和文章在荷蘭，德國，法國，意大利，日本評論PTLens。
PTLens旨在糾正建築照片所示傑夫·林奇的部落格和伊恩布拉默姆的發佈圖像失真。

PTLens is software that corrects lens pincushion/barrel distortion, vignetting, chromatic aberration, and perspective. The following are supported:

PC (Windows 2000 or later, screen resolution at least 1024×768 DPI 96)
Standalone application (JPEG, 8 or 16-bit TIFF)
External editor for Lightroom (JPEG, 8 or 16-bit TIFF)
Plug-in for Photoshop (any 8 or 16-bit RGB image)
For further instructions view the ReadMe file included in the download

Mac (MacIntel OS-X 10.5.2 or later, screen resolution at least 1280×800)
Standalone application (JPEG, 8 or 16-bit TIFF)
External editor for Lightroom/Aperture/iPhoto (JPEG, 8 or 16-bit TIFF)
Plug-in for Photoshop (any 8 or 16-bit RGB image, Photoshop CS3 or later, PSE 6 or later)
Plug-in for Aperture (JPEG, 8 or 16-bit TIFF, version 2.1 or later)
For further instructions view the ReadMe file included in the download

View examples of PTLens at work, watch a video of PTLens in action, and download the software for a free 10 image trial. Click on the picture for more images of Antarctica.

Multiprocessing

Modern computers often have processors that contain more than one core. Each core can work in parallel to handle computationally intensive tasks. To improve the performance of PTLens on your system choose Tools > Options (PC) or Preferences (Mac) and specify the number of threads on your system.

The following table illustrates the time it takes to process a 24MP (6000 x 4000 pixel) image on a system with a processor that has 4 cores and supports, via hyperthreading, 8 threads. The image was corrected for barrel-pincushion distortion and all sliders for Perspective, Vignetting, and Chromatic Aberration were enabled.

Processors     Seconds
1     10
2     6
4     4
8     3
16     3

When only correcting for distortion it took less than 1 second when utilizing 8 threads. Specifying the correct number of processors improved performance by a factor of three. No benefit is gained by specifying more processors than supported by your architecture. There was no penalty either as the overhead for extra threads is minimal.
Historical Note

PTLens is the first application to automate distortion correction. It all started on August 20, 2002, when I posted the following message in a news group:

What I need is a batch program that reads EXIF information from a JPEG
file, looks up the closest match in a table, and automatically corrects
for distortion.

Well, I can dream, can’t I?

Nobody volunteered so on September 19, 2002, I released version 1.0 of PTLens. Several years and 30,000 lines of source code later PTLens has evolved from a simple DOS command-line program to an easy-to-use application and Photoshop plug-in that corrects distortion, vignetting, chromatic aberration, and perspective. As a developer I subscribe to the Unix philosophy: Write programs that do one thing and do it well.

The “table”, referred to in the above quote, consists of more than 2400 separate calibrations — far more than any other application. Site DpReview has compared PTLens with DxO and Photoshop CS2 (I’ve since improved vignetting).

See a review for PTLens at Digital Outback Photo and articles in Dutch, German, French, Italian, and Japanese. PTLens is designed to correct distortion in architectural photographs as illustrated in Jeff Lynch’s blog and Ian Bramham’s published image.

糾正鏡頭的枕狀.失真.色差和暈影 Epaperpress PTLens 8.9 Homepage – http://epaperpress.com/ptlens

糾正鏡頭的枕狀.失真.色差和暈影 Epaperpress PTLens 8.9 : 5 MB