create an app for iPad making/convert jpg/tiff files in 300dpi? and saving for printing in cmyk?

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Dear madam/sir,
I work mostly on an iPad. All graphics programs are not great at saving more in 72dpi and RGB. I have in a long time only needed for web illustration but now I need for print. I have an iPad Pro and highly recommended media memory, so I thought that isn't going to be a problem.

I also know about company own icc printing process, but I was hoping/looking for a product working in a cmyk graphics profile directly. So many beautiful details don't get lost. I know l could change my workflow to a pc (illustrator or photoshop) but I really like the interesting interface working in an iPad.

So Is it possible for you firm could create an app for iPad making/convert jpg/tiff files in 300dpi? and saving for printing in cmyk? Your firm don't have a product who have those applications. So I'm have a good idea because I think that there is a marketplace for a new product.

Thanks much for listening
Yours sincerely
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caroline scheibel

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Posted 2 years ago

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Michel BRETECHER, Champion

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Two wrong asumptions:
- 72 vs 300 ppi.
Your image is made of pixels. The only thing that matters for quality in digital image is the size in pixels. Any ppi indication in a digital editing software is only there as a 'tag' to show you how large in inches/cm your printed image will be. You can change the tag as you want, not a single pixel is changed. Changing the number of pixels is called resampling: that does not give you any more detail.
- Apart from offset or other professional printing solutions, all printers and printing services require RGB as input, not CMYK.
And you know what? CMYK is a smaller color space than RGB.
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caroline scheibel

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Thanks for everything, and a good answer. And I know the difference between RGB and cmyk. I need help for printing in offset/professional printing poster in A0 or A1/B1. So I need to start working process in cmyk color in the beginning and saving in high dpi. All programs I have on my iPad doesn't have a setting "working I cmyk" og save for cmyk in 300 dpi. Do you have good ideas to a workable process in ipad content?
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Hmmm... Caroline has problems many professionals might have when higher resolution and CMYK output is required for professional printing of an artwork. What seems to be a nice image on an iPad screen might not contain sufficient ppi data for high resolution bitmap printing to the size required or might contain colours which, simply, can not be printed.

It appears that drawing apps are often dumbed down to the extent that any control of the output resolution, colour space and format is impossible. So it might not be strange if some apps would interpret iPad ́s retina resolution (264 ppi) as 72 ppi in saved files. And we all know about the relation of image resolution and size of the image. Setting the initial image resolution will certainly determine the quality of the printed output as long as the images are bitmap images.

Furthermore, precisely the mentioned fact that RGB space has a wider gamut is the issue when the main reference is the printed output as it is for Caroline. What looks beautiful on screen in RGB often does not look good when printed since not all RGB colours can be printed by CMYK process; and this is the reason Caroline wants control over RGB to CMYK conversion.
I would suggest Caroline to shop around for an app which provides such more advanced editing features, maybe vector, nondestructive editing basis which might provide her with resolution independence, work with process colours and more flexibility when saving her work.