This is the view I get when I want to upload a file to OS X' browser. I like the thumbnail view, but as you can see, they are too small.
I don't mind showing fewer pictures – I just want a bigger thumbnail view.
How can I change that?
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This answer applied to whatever version of OS X I was using in 2014.
/usr/libexec/PlistBuddy -c 'set FK_StandardViewSettings:IconViewSettings:iconSize 48' ~/Library/Preferences/com.apple.finder.plist
48 is the new icon size, and restart to apply the changes. Just logging out and back in does not seem to apply the changes.
FK_StandardViewSettings settings are used by FinderKit and file dialogs. They are not changed when you press the "Use as Defaults" button from Finder's view options.
If you run the command on a new installation and there is an error like
Set: Entry, "FK_StandardViewSettings:IconViewSettings:iconSize", Does Not Exist, open a file dialog once in some application first.
There is a way to fix this even in Sierra. You will be using Pref Setter to set the iconSize value in com.apple.finder.plist This file is not visible to some users,so use the Go to Folder command and enter this path:
http://www.nightproductions.net/prefsetter.html is where to download it. It's free and while a bit old does work.
Open com.apple.finder.plist in Pref Setter and change the iconSize value as shown. Press Enter to confirm the new value, save changes and exit.
Restart your Mac and your Open/Save dialog thumbnails should be as in my case 256 pixels instead of the default 64. Hope it goes well for you.
Apple's "Preview" app is designed to do this; just drag a folder's icon on top of the Preview icon, to preview the contents for any of the graphic formats supported. You can resize images in the preview pane on the left, by dragging the divider horizontally; click on a preview/thumbnail to open the corresponding image...
There is no straight forward solution to show bigger thumbnails, however there are few workarounds.
For example you can use the 4th view to show items as icons, but also with in Cover Flow view.
In Cover Flow view you can have images much bigger (depending on size of your window).
Alternatively activate Zoom in Accessibility (System Preferences) and hitting ⌥-⌘-+ will zoom the thumbnails. They should be in enough resolution on retina display.