This year I was helping a not for profit organisation to put a slide show together, and ran into a problem where a facility needed images in specific dimension ratio. Not a problem: we had already decided to use PowerPoint as the background so we could set up the slide deck view in the right size, drop all the images on a black background, then export the whole slide deck in the correct image type so each would be the right size. Easy.
A 16:9 ratio was required, and we so simply set the screen size to 33.837 x 19.05, checking that this fitted with the 1920 by 1080 ratio. We scanned and loaded lots of images; cropped, straightened, faffed about and finally exported all the images in the correct file type to a folder. We asked loads of people, including the administrator, to check the resulting images. The reports came back that everything was OK.
Luckily we had factored in enough time to do a test run, to go and see the images on screen for ourselves in situ, as we arrived to find that there were two issues. Firstly, all the images needed to be rotated 90 degrees to the left as they were being shown on two widescreen landscape TVs, hung in a portrait orientation. Obviously no one had updated the TV firmware to rotate the on-board orientation, and no one had told us of that requirement (not a biggie: Ctrl & A, right-mouse menu, rotate all).
Secondly, apparently our image ratio for the images came to 720 by 1280 pixels, and was therefore the 'wrong' size. I found this quite puzzling: if the ratio was right, why would the actual pixels matter? Because apparently the TV software is set to the actual pixel - dot - count, and if the size is smaller than the available dots on the screen, the image will be shown as a smaller image within the available space. Maybe. Or it maybe offset. Or top left. Or bottom right. But not necessarily filling the screen. Sigh.
It made me realise how cross-platform compatibility has moved on quite a bit, as we have got so used to devices being able to resize. And the big screen TVs in this facility were not PCs.
Back into PowerPoint to set the image as a pixel size instead of a centimetre size. But PowerPoint doesn't allow us to put a pixel size in. What we needed was a pixel converter. And there is a handy little site that can do just that at Unit Converters (2025). We punched in our two numbers, resized all the slides, re-saved all as the correct image type, rotated the lot and finally were able to test them.
Phew.
Sam
Reference: Unit Converters. (2025). Convert Centimeter to Pixel (X). https://www.unitconverters.net/typography/centimeter-to-pixel-x.htm

















