When I got my Macbook about 9 months ago one of the first things I did was change the default OSX screenshot format type from PNG to GIF. I edit a lot of images in Photoshop to post in technical articles and for the GIF’s I have been having to change the Photoshop Image Mode from Indexed Color to RGB to apply most filters during the process of editing the image. Photoshop loses a lot of functionality when an image’s Image Mode is set to Indexed so each time I modified an screenshot image and say wanted to apply a filter I would first have to modify the Photoshop Image Mode from Indexed Color to RGB. I recently got fed up with having to do that so I was looking for a solution when I realized if I just change the default screencapture format back to PNG the images open in Photoshop with the Image Mode set to RGB or Red/Green/Blue Color Model. Anyhow when doing so I started to wonder what image formats were available to set as the default screencapture format. Below I describe the details of what screencapture image formats are available in Mac OSX Lion and also what Image Mode that Adobe Photoshop opens each format from the Mac in.
When editing a GIF image via Photoshop earlier I needed to blur out a couple items in an image I had taken however I was unable to use the Photoshop filters that I typically use to do so. Each of the Photoshop filter menu items were greyed out and Photoshop would not let me select any of them. Use the information below to modify the Mode and enable the ability to use the Photoshop filters.
I was attempting to save a file at 16 color 4 bit depth using Photoshop 4 on a Windows XP laptop. After creating or modifying the image and attempting to save the file as a bitmap (.bmp) the bitmap options would popup though I was unable to choose 4 bit under the depth option. I figured the image may have to many colors and decided to try to switch the “Image Mode” to Grayscale.