Hello Everyone.
I wonder if you can help.
I am still using the Apple Aperture program on my Mac to process my photographs. I am using the latest operating system (macOS High Sierra). I shoot in RAW and as a result all the photos on my mac are around the 25 MB each. However when I transfer the photos to an USB disk to take to be printer, the photos are converted to jpg and the size on the USB disk is reduced to around the 1 MB. The photo printing technician consider this size (1MB) to be a low resolution and cannot get a good print.
Can anyone please tell me how to transfer a high resolution photo from my Mac to a USB disk and maintain the size the same as the one on the Mac?
I appreciate your help.
Gus
Hi Gus
Try - File, Export then Version, a dialogue box will open. Choose Export Preset and you should see a set of different options available including high quality TiFF and JPGs. You can also edit and add your own presets.
gary
Hi Gary
Thank you for your quick response.
I did what you suggested and found a number of options. I exported one photo of 30.46MB using 4 different options:
JPEG original Size, PNG original size, PSD original size and TIFF original size. The exported images resulted in different sizes ranging from 1.2MB for JPEG, 10.4MB for PNG and 51.2MB for PSD and TIFF images.
Why such difference in the exported files and which of these files are best for printing? How come the exported TIFF & PSD files are larger then the original file?
I look forward to your reply.
Regards
Gus
Hi
First I’m no expert on this :)
The Raw (sometimes referred to as a digital negative) file is just that, a collection of data representing the image at capture. When you view the image in camera you are seeing, I think normally a Jpeg version of that data.
The programme you use in this case Aperture also interprets that data into a form that can be seen. When you come to exporting the data you can, from Aperture choose the type of file to represent that Raw data. Different file types Jpeg, Tiff etc have various technical ways, far beyond my knowledge, of saving this data.
A Jpeg will never contain the full amount of data as compromises have to be made. It will compress the file and throw away bits of data. You can control this to a certain extent and alter the size of file v amount of data lost. For printing save as the biggest / best quality option if using on the web you can use a lower size file without too much quality lost. Jpegs are termed a lossy format - data is lost on repeated savings of files.
Tiff files can be bigger than the Raw as it has to store information on each colour whereas I think Raw does things differently.
Try searching Raw v Tiff - there a some better explanations than I can give.
I don’t shoot Raw, but use film, scan as high quality Jpegs (purist will probably say no such thing!) and print from there up to A3 size.
I would ask your printer what size file they require for the print size you need.
Also try
https://discussions.apple.com/community/professional_applications/aperture
it is still an active community and has some very helpful and knowlagble people.
best wishes
gary
oops!
Also try
https://discussions.apple.com/community/professional_applications/aperture
it is still an active community and has some very helpful and knowlable people.
best wishes
Thank you Gary for your advise. I have now start exporting photos using Tiff original size (16-bit) file instead of JPG and as you said it is a much larger file that produce a much better prints.
I will also check the links you sent me.
Much appreciated. Regards
Gus
ha!
knowledgeable