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Video: Resolution VS Dimension

Posted on 2014-02-13
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Last Modified: 2014-02-18
Hi,

I am have just started using Screenflow to record online tutorials.

I find the software great and it's very easy to use, however i have a few questions:

01 - what is the difference between resolution VS dimension?

02 - my screen resolution is 1440 x 900 so obviously when i record my screencasts, they are 1440 x 900 - however when i export them i know i should be exporting them at 1280 x 720 - does this mean that my video will be cropped or skewed?

03 - is it possible to set your Screenflow canvas to 1280 x 720 instead of relying on your screencast recording to determine the size?

04 - i get a lot of different options to export at... so i presume it is best to export at Lossless ProRes so i don't lose any quality? I have exported at Web High and i find the video quite blurry compared to the Lossless ProRes, however i am worried that when i upload to YouTube the LossLEss ProRes will then become blurry?

Thanks in advance for your help.
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Question by:oo7ml
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Eoin OSullivan earned 2000 total points
ID: 39856404
oo7ml

01 - what is the difference between resolution VS dimension?
There isn't really any difference .. resolution is the number of pixels per inch or centimetre and dimension is the size of screen or display usually in centimetres or inches (diagonally).  If you multiply the horizontal dimension by the ppi you'll get the overall width in pixels of a screen.
Typical guidance for screens was 72 pixels per inch (ppi) however the new "retina" displays have much higher resolutions up to 300+ ppi
http://en.wikipedia.org/wiki/Retina_Display


02 - my screen resolution is 1440 x 900 so obviously when i record my screencasts, they are 1440 x 900 - however when i export them i know i should be exporting them at 1280 x 720 - does this mean that my video will be cropped or skewed?
Clearly 1440 is bigger than 1280 so the video will be scaled down a small bit (1.125)
If you scale down the 900 by the same percentage so the video is in proportion then it SHOULD be 800 pixels high .. however your target dimension is 720 pixels so there are two options
 a. crop a small amount from the top and/or bottom of the video (in this case you lose some content possibly)
b. squash the image slightly in the vertical axis to fit it all in (you'll get some level of distortion and increased blurriness)



03 - is it possible to set your Screenflow canvas to 1280 x 720 instead of relying on your screencast recording to determine the size?
Yes, Once the video is recorded you can use the CROP button on the grey bar above the timeline to select an area of the screen to export.
I think you are not looking for this .. but are really looking to EXPORT the full screen to your desired dimensions ..
There are 2 export options .. scale by percentage or scale to custom size.  If you pick custom size and enter your dimensions of 1280 x 720 and check the box to "Letterbox Content" then it will output your video at exactly 1280 x 720 but it will add small back bands to the sides to prevent distortion as per pervious point as the source is not the EXACT same proportion as the output.

04 - i get a lot of different options to export at... so i presume it is best to export at Lossless ProRes so i don't lose any quality? I have exported at Web High and i find the video quite blurry compared to the Lossless ProRes, however i am worried that when i upload to YouTube the LossLEss ProRes will then become blurry?
LossLess ProRes video is the better quality but the filesize is MUCH bigger than Web High as you've seen.
YouTube will always analyse and re-compress your video in their own format after you upload it so let them worry about retaining the quality.  Upload the best quality you can afford it will just take longer to upload, use more space and be slower to process but the better quality should be maintained.
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by:oo7ml
ID: 39864854
Thanks Eoin, great help as always.
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by:oo7ml
ID: 39866793
Hi Eoin,

Do you know of any free video stock websites. I am aware of istockphoto.com etc but they are really expensive. Any ideas?
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