Author Archive for Mun L


River and Rock


Learn about landscape photography from Micheal Frye

I borrowed a landscape photography book from the library. The book’s name is “Digital Landscape Photography” by Micheal Frye, this book is providing the photographer a few techniques of how to approach a landscape shot. It is not another technical book of how to use the camera or photoshop. I like this book because it goes right to the point of “what makes a good landscape picture?”. One of the take away from the book is the Zone System, he explained it in a very simple fashion and targeted to Digital DSLR.

Here’s another one of the technique that I learned from the book. “Expose for highlight and develop the shadows”, which is the reverse way of the old film photography. Based on the Zone System, use the “spot” meter to measure the highlight of the scene (which place the point at Zone 5). Then “up” the exposure to about 2 stops, which now set is to Zone 7 (double check the histogram for clipping). Once the photo is taken, time to process it and “develop” for shadow.

After reading the RAW file into Lightroom, you can quickly process the “under” contrast picture to some what OK state, where the photo’s histogram is stretched. Now finish it off with the “Brush” to “Darken” the shadows a bit more, this “development” phase will bring up the contrast of the a specific area. I was amazed how easy it is and how it help to pop-up the selected area. Remember not to over do it, otherwise, you will see patches of “black” spot all over the photo. The “Density” bar controls the intensity of the brush application, I usually set it to around 30% and increase when needed. I hope this short tips helps and for details you can pick the book.

Here’s the photograph that I “developed” for shadow:


The photographs shown in his book do have a sense of Ansel Adams footstep. I hope one day, I can make a masterpiece that has a sense of timeless and feeling in my photograph.


warm summer sunset


Del Valle morning


Why am I getting timing results difference between PnR and STA?

This is a aged-old common question asked between the front-end design engineer and the PnR engineer.
It is lesser a tool issue, but more of a communication issue between the two entities.

Here’s a few items that might contribute to the difference:
– Is both using the same set of timing constraints used?
– Is both using the same derate factors?
– Is both running with SI?
– Any difference in the uncertainty setting between the two results?
– Is clock-gating/reset check turned on for both?
– Is both evaluating the same set of mode or corner?

If all the above are checked and yet still some difference, then there could be some parasitics extraction difference.
Double check if the SPEF extracted and used in timing closure is consistent with the PnR setup.
PVT definition; RC/R-only/C-only..

I hope this will help to align the prospective in debugging the differences.


Face of El Capitan, Yosemite (B&W)


pink and green


My Gallery

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Yosemite National Park Gallery

Alum Rock Park Gallery

Mono Lake

Some of my older postings