Here’s something you might want to read and bookmark for future reference. Photographer Robert Thomas has written up an in-depth article explaining what the different Photoshop blending modes are and how they actually work:
Working with blend modes is almost always an experimental process. Because it’s nearly impossible to predict the results, you always seem to end up experimenting with different modes and Fill Opacities until you get the results you’re looking for.
In this article I’m going to give you a high-level view of what the various blend modes do, and then I’ll dig deeper into the nuts and bolts of the blend modes by explaining some of the math involved, and their interrelationships with each other. I’m not going to “show” you how the blend modes work—I’m going to “explain” how they work. By the time you finish reading this article, you should have a better idea of how to use blend modes and where to begin your “experimentation,” which in turn should reduce the time it takes to achieve the results you’re looking for.
Photoshop Blend Modes Explained [PhotoBlogStop via swissmiss]
Want to estimate proper exposures without a light meter and don’t mind doing some simple arithmetic? Check out this wonderful Exposure Time Tables pocket reference that was published Zeiss Ikon.
Still shoot film? Use filters when you shoot? FilterCalc is a new Android app that’s designed to help non-TTL photographers figure out proper exposure when using filters.
This base ISO exposure calculator comes with preloaded database of almost 500 filters. By selecting the actual ISO value and filter type, the app computes base ISO to be used with the light meter resulting in proper exposure.
FilterCalc can compute ISO compensation in increments of 1/3, 1/2, 2/3 and full stop EV. You can select compensation values by stops, by filter factor, by preloaded filter brand/type, or add your own custom data.
The app is free and can be downloaded over on Google Play.
FilterCalc [Google Play]
Digital Camera World magazine created this handy free infographic showing the color temperature scale and where various preset white balance settings are found in it. You can download the full version here.
What is color temperature: Free photography cheat sheet [Digital Camera World]
Posing App is a new app that offers a pocket reference for poses — helpful for both photographers and models. The 140 hand-drawn poses come in a variety of flavors — children, couples, weddings, and women, to name a few — and are accompanied by short descriptions that provide additional pointers. The is available from the iTunes App Store for $2, and will be released for Android soon.
Knowing how long to develop film for is easy if you use popular films and developers, but what if you want to use some obscure combination that isn’t well documented? If that’s you, check out the Photocritic Film Development Database. It’s a simple service that outputs development times for 1440 different film/developer combinations. For combinations that aren’t officially published, creator Haje Jan Kamps has come with a formula that estimates the time — a formula that he says is surprisingly accurate.
Photocritic Film Development Database (via Pixiq)
Update: Digitaltruth also has a massive film development database/chart.
The Twilight Calculator is a free and useful web app that takes in your location and spits out a table with when you should photograph if you want to shoot during golden hour.