Channels & Masks Lesson 10: Using Calculations in Photoshop

Submitted by colleen on 24 April 2009 - 1:18pm.

It's Friday, but seriously, deeple, get your entertainment and education at the same time as you enjoy this video which I pilfered for your enjoyment from the companion DVD of Deke's Photoshop CS4 Channels & Masks One-on-One book.

In this lesson, Deke introduces you to the Calculations command which can be a little tricky, but oh-so-very useful and important to understand. As Deke notes:

Now I won’t sugarcoat it, Calculations is not easy—in fact, it might be Photoshop’s single most difficult feature to master. But it is the command that’s going to increase the quality of your masks.

When you're done, you can return to your less edifying Friday festivities. Happy Weekending, Deeps.

 

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Comments

Change in CS4 - Preview - P

Submitted by peh on 28 April 2009 - 3:52pm.
I just finished the CS4 Adjustments lesson on Lynda - went to PS to try it out and I seem to have discovered something troubling. At least to me. Hopped into a curves panel, whoosed around the sliders and ...there is no Preview check box. Hence no un-preview. And no P key shortcut. I can toggle the layer visibility, but that is a mouse move, and I can find no keyboard shortcut for toggling vis. I tried Shadow/Highlight and my trusty P shortcut still works. Whew. Am I missing something? Will I have to change? I am not so good at that.

My Eternal Huzzahs Will Go To...

Submitted by jude on 27 April 2009 - 9:03pm.
...the individual or individuals who remove from this otherwise stellar blog the b&w photos of the panting dog with the pierced tongue. The photograph is as disturbing as the art of Eyvind Earle. Also, I think I'm going to change my vote from four months ago on Deke's fate FROM Smart Objects TO Blending Modes. So let it be written, so let it be done... -30- "Thanks again, for another day full of something that I just can't put my finger on." -- Kim Knoche

Issue with indesign one on one lesosn 2 HELP!

Submitted by wood5y on 28 April 2009 - 4:14am.
Hey there, just having a slight issue with the Professor Shenbop task in lesson 2 of the One on One book. I have made the circle ready to receive text and have pasted the text on the top line. Everything works fine EXCEPT I get these weird red lines off to the top right of my page after I have pasted the text. I thought I had incorrectly snipped the red circle but not so, When I flip the text vertical the red lines flip as well. Help what am I doing wrong?

Disable dynamic spelling

Submitted by david on 28 April 2009 - 4:37pm.
Another option you have is to disable dynamic spelling. To temporarily disable InDesign's helpful squiggles, choose Edit→Spelling→Dynamic Spelling. A check next to it means it's turned on; nothing means it's turned off. To have Dynamic Spelling turned off by default on any new documents, go to the Preferences, then Spelling, and make sure the check box by Enable Dynamic Spelling is not checked.

haha...i had the same problem

Submitted by beardog on 28 April 2009 - 3:02pm.
...then i found out the word "Shenbop" isn't in my document's dictionary! InDesign likes to underline misspelled words with red. If you add the word to your dictionary via spell check (ctrl + i), it will disappear!

shenbop to the rescue!

Submitted by wood5y on 28 April 2009 - 4:38pm.
Thanks, trying it out now!

All good!

Submitted by wood5y on 28 April 2009 - 4:43pm.
Thanks for the suggestions, you were both right and the problem has gone away! Thanks!!!!

Thanks Deke!

Submitted by AlExAkE on 27 April 2009 - 1:25pm.
I see. So I guess I'd just leave the way I have it right now. Thanks again for your answer. I appreciate it! -=|AlExAkE|=-

Removing/Disabling not common file extensions!

Submitted by AlExAkE on 27 April 2009 - 2:38am.
Hey Deke! I'm sorry this here is not exactly on the topic but is Photoshop related! I didn't know where else or who else to ask, and since you are the Photoshop guru I would really appreciate if you can help me here! _________________________________________________________ Every time I have to save a file in Photoshop there are hundreds of extension, most of which I don’t EVER use! I want to make it easy to find the ones I use the most and removing the rest. So what I did is I went to Photoshop folder: C:\Program Files\Adobe\Adobe Photoshop CS4\Plug-ins\File Formats and deleted all the extensions inside BESIDES: Bmp.8bi , Gif.8bi and Png.8bi I want BMP, GIF and PNG to be able to save as them. Now when I go to Photoshop to save an image there are fewer extensions but still there are many that I never use. How do I remove them so Photoshop don’t load and show them up? All I need is: *.PSD *.BMP *.GIF *.JPG *.PDF *.PNG I've marked with red the ones I want to REMOVE. Thanks http://img17.imageshack.us/img17/7285/nowq.png _________________________________________________________ -=|AlExAkE|=-

Not everything's a plug-in

Submitted by deke on 27 April 2009 - 3:58am.
Much of Photoshop is extensible, but most of the features reside inside the core program file, which is why it's several MB in size. EPS, TIFF, and PICT (sadly on that last one) are hard-wired into the program and cannot be removed. (Or, at least, I don't know how without harming the integrity of the program.)