I need to export a photo at around 1meg file size,and dont seem to be able to do it in the presets can anyone help please ,I shoot on a canon 5d

I need to export a photo at around 1meg file size,and dont seem to be able to do it in the presets can anyone help please ,I shoot on a canon 5d

I believe Frank is referring to the end use (e.g., for print or on-screen use).
Until he returns, I can tell you that I ran a quick test using an image from the Aperture 3 training book library which was as follows:
Camera = Canon EOS 5D Mark II
Master resolution = 5616 x 3744 (21 MP)
I was able to export to a JPEG with end file size of 1 MB as follows:
Export Presets drop-down > select 'Edit' option
Selected preset name 'JPEG - 50% of Original Size' > change percentage value to 40% > change DPI value to '300' > click OK to set as current default > Export version to desktop.
The exported JPEG has a resolution of 2246 x 1498 and appears on screen to have the same image quality of the original in Aperture.
Note - I did not change the default Image Quality slider in the Export Preset dialog (which left it at 10).
Basically, you will need to play around with the settings until you find the appropriate values to arrive at an image version you want.

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