I've been doing a little bit of printing lately of my photographs and the like (Not myself, but via internet printing services.)
I've come to notice that file sizes seem pretty big.
I recently made a pop up banner for my sister, the photoshop file size: 85.29cm x 220.29cm (10074 x 26019 pixels)
I saved it via "save as".. then JPEG, with "12" as the quality, i.e full quality. The JPEG size was 42MB :|. Does that sound about right?
Just seemed a lot to me at first, as it was too large to E-mail, so had to upload it to my website for the printing company to download.
Also, I scaled a picture from my Nikon D40 up to 4724x7087 pixels, saved as jpeg with full quality and it was 26MB.
Again, might just me, but that seems a little bit on the large side.
Am I doing something wrong?
I have just copied what you have done and yes the file is this big. There is no need for this size as you can quite happily reduce the pixels/inch of a banner to 180 and this would give a 25mb file. Large advertisements outside shops are half this figure as they are viewed from further away, as is your banner. I do alot of my own printing and for others upto A2 and for anything viewed close to the body i would only use 300 to 450 pixels/inch. As the distance to viewing increases, a minimum of 180 is more than suitable for the human eye.