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working with 300 dpi in AE for 2K video project that need to be transfered to FILM
Hello Cow members,
I am working on 2K 2040x 1152 pixel (16:9 ) project that need to be transfer to Film at the end. My editor told me that i should import still images with 300 dpi because it’s going to be transfered to film. He’s basically saying zoom in looks way better with 300 dpi image in AE. What i’ve been doing instead is that i changed all of 300 dpi image to 72 dpi in photoshop and i changed the size to bigger than 2040 pixel in width for image so that i can have more room to zoom in or panning, tilting. All the images i imported has been scanned in 300~ 600 dpi And, they are bigger than 2040 x 1152 pixel in size. So, i was able to change the size of image without losing resolution even though i lower the dpi number. I remember i once work with 300 dpi images by accident in AE it was way too big to handle in AE. it just makes work flow so slow. I am pretty sure my editor got wrong information on this. But, i need an official prove to shut him off. Please help me to confirm this 300 dpi vs 72 dpi theory for film transfer. Thanks in advance. -
4 Replies
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It’s irrelevant. A 72dpi image and a 300 dpi image will be exactly the same, given that their pixel dimensions are the same. You can test this. Save off a tiff or whatever of an image, one at 300ppi and one at 72ppi, making sure that their pixel dimensions stay the same (Photoshop will try and change them as you change the ppi in image size). Then import both into After Effects. Lay them one on top of the other in the same composition and set the top one’s blend mode to difference. Move the cursor over it and notice in info that all pixels are black. That means there is no difference.
dpi is actually to do with a printers resolution anyway. ppi is the equivalent referring to a screen’s size or resolution. Photoshop uses ppi relative to the documents intended print resolution in inches.
Inches has nothing to do with it. Just make sure you have enough pixels! 🙂
-Ben.
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to say that the pixel size is “irrelevant” may be a bit misleading. there might be some confusion over terminology and what photoshop calls the DOCUMENT SIZE as opposed to the PIXEL DIMENSION. keep in mind that a photoshop picture with a DOCUMENT SIZE of 720×540 at 72dpi and one with a DOCUMENT SIZE of 720×540 at 300dpi are NOT the same when you open them in AFX. the latter is approx 4 times bigger and the 720/300dpi pshop picture’s PIXEL DIMENSION is actually 3000 pixels wide.
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“But a 720×540-pixel document remains a 720×540-pixel document.”
well, not exactly. when you look at the IMAGE SIZE menu panel (commmand/option/i) in photoshop it uses the terminology DOCUMENT SIZE to describe the dimensions AND the resolution. a picture from photoshop with a DOCUMENT SIZE of 720×540/300ppi displays 4 times bigger in AFX than one that has a document size of 720×540/72ppi, right?
it doesn’t matter if you look at it in inches, centimeters, points or pixels. perhaps just a question of different terminology. seems like the important reference is what photoshop refers to as the PIXEL DIMENSION, which is the actual pixel size and takes into account the ppi setting in the pshop document size panel and is the actual displayed size of the image in AFX.
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Ok. thank you for the answers . And, i understand all of your point. But, let’s get back to original question.
How much quality loss will happen when 300dpi 2048x 1152 pixel image changed into 72dpi 3000 x 2003 pixel in size. I actually tried it in photoshop. And, i imported in AE. And, the photo quality seems still super sharp in full quality and 100% view. or i would say it’s very acceptable. And very usable quality. What i did was wrong? Please answer yes or no and explain why.Another question is when 300 dpi image imported in AE. How much scaling is possible without losing full quality? If i imported 72 dpi image i will see the pixelation as soon as i increase scale more than 100%. But, when i import 300dpi image i can increase scale to more than 100% and still doesn’t look pixelated. is there any way i can calculate it when i scaling image that higher than 72 dpi in After effects?
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