On the developer's console when you go to publish your android application the screenshots are needed with the following specifications, 320 x 480, 480 x 800, 480 x 854,1280 x 720, 1280 x 800 24 bit PNG or JPEG (no alpha) Full bleed, no border in art. Now on this link it says, "You may upload up to 8 screenshots." My questions is,
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The files need to be in a JPEG or PNG format of 24 bits, in a 2:1 ratio if it is a portrait and a 16:9 ratio for landscapes. Be careful that if you go for different sizes: the maximum size should not be more than twice bigger than the minimum size.
At last! I got the answer to this, the size to edit it in photoshop is: 379x674
You are welcome
You can upload up to 8 screenshots. Those screenshots must be one of the dimensions (sizes) you listed; you can have multiple screenshots of the same dimensions.
When I publish apps I use the following screenshot sizes:
Phone: 1080 x 1920 I prepare 8 images with title, some fancy background and a screenshot inside a smartphone mockup. So it's more than a simple screenshot. It gives some nice branding and helps you to stand out from other apps out there.
Tablet 7": 1200 x 1920 - I do actually a couple of raw screenshots of 7" emulator so that the user could know how the layout will appear on his device. No fancy design with titles etc.
Tablet 10": 1800 x 2560 - same thing here, just a couple of raw screenshots.
all in .png
format.
Hope this helps.
https://support.google.com/googleplay/android-developer/answer/1078870?hl=en&ref_topic=2897459
Source: Stackoverflow.com