: Can just make or design the photo in 72dpi, and just change it to 300dpi later on? :) I'm not a professional graphic designer or anything but I love making stuff on photoshop. I have a problem

@Turnbaugh909

Not really. But it depends.

If you are working with vectors then you can resize with no problem but if you are working with raster images then you are out of luck.

See: What are the differences between vector graphics and raster graphics?

If you are working with raster images, changing the resolution (PPI) and keeping the physical dimensions the same will mean resampling the image and a loss in image quality. There are techniques for upscaling images, but they shouldn't be used as part of a design process in any way, they should be a last resort if you don't have access to high resolution originals.

See: How can I increase the size of a .jpeg without losing quality?

If you are working exclusively with shape layers and paths within Photoshop, they are treated as vectors and can be resized with no problem (inside Photoshop at least). But any rater layers will be resampled. There can be problems scaling some live effects too, which you can get around by rasterizing but then you will be upscaling raster images which is what you don't want to do.

See: Are shapes in Photoshop vectors?

Basically, you should always work at full resolution. If anything it is more usual to work at a higher resolution and downsample. Avoid upscaling images as much as possible.

With regards to the resolution, read through (there are a lot of 'linked' related questions too):

I need to print an image at a certain size. What dimensions and resolution should I use?

300PPI is a general rule of thumb, but is more appropriate for material that will be read close. Your canvas is quite large and depending on the viewing distance you could probably get away with 150PPI.

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