Now, suppose you want to submit this image to a stock agency that requires a 48MB file. Yet the "saved on disk" file sizes are radically different. The File Size for each of these is 23.4 megabytes. And all of them, when open in Photoshop, are the same 23.45 Note that all files are of the same image and are the same pixelĭimensions. I can also look at the various saved versions in Adobe Bridge. Then open the Image Size box again, CHECK THE RESAMPLE IMAGE BOX, set your Pixel Dimensions, and click OK again. TheĪlternate is to first open the Image Size box, UNCHECK THE RESAMPE IMAGE BOX, change the Resolution and click OK. Reflect your new Resolution and it can get very confusing.
If you change the ResolutionĪfter changing the Pixel Dimensions the Pixel Dimensions will change to Then set your Pixelĭimensions after changing the Resolution. This, make this the first thing you change. This number to whatever you want or need it to be. Pixels/inch, or 180 pixels/inch, or 240 pixels/inch. If you are working with JPG files this might show as 72 Raw files you have the option to set the resolution you want in your Not come into Photoshop with this same number. The file size listed after Pixel Dimensions: is theĪbove the Resolution is set to 300 pixels/inch. I can see thisīy going to Image > Image Size and reading the first line in theĭialog box. In Photoshop I can see that the image is 23.4 Megabytes. I have saved this same image in a number of different formats. Right now I have open in Adobe Photoshop an image from the CanonġDmkII. When you open the file in your image editor you would see that it has Would be a smaller file size as a saved file (the exact size willĭepend on the content of the image and how well it compresses). If you saved that same file as an LZW compressed 8-bit RGB TIF file it To the size it takes up when open in your image editor. There might be a few extra bytes used for a saved preview,Īn included color profile, etc. If you were to save this file as aĨ-bit RGB uncompressed TIF file it would be about 23.5 megabytes on your The file size for an UNCOMPRESSED RGB file at these This is an 8 megapixel camera that outputs images that areģ504x2336 pixels. I will use a Canon 1DmkII as the benchmark and talk about pixelĭimensions. Let's take the example of an image that you have versions of as a TIF and as a JPG. * The size of the file open in your image editor Think anyone has come up with good terminology that distinguishes which Images have more than one file size, and I don't (please note, this is a re-run of an article that has previously appeared on my website in the days before blogging) Whenĭiscussing digital images there is much confusion about file size
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