Resize AND resample... in what order?

Question

Hello all.  I've had to resample images up a bit on occasion for use at larger sizes (i.e. placement in Illustartor or INDesign at a larger size) and have done that with good results. However, I have a different situation now.
I have an image that is 300 dpi. I am working on a huge display in InDesign, and I've had to place this image at 392%, which gives me an effective dpi of 76.
The display company I'm working with wants the image placed at 100%, but needs only 100 effective dpi due to the nature of their technology.
So I think what I need to do is both:
- reSIZE the image to 392% AND
- reSAMPLE the image to be 100 dpi.
I believe this will have to be a two-step process using the Image Size palette. My question is, in what order do I take these two steps and what settings do I use in the Image SIze palette to get the best results?
Using Photoshop CS5 12.0.4 on Mac OS 10.6.8.  Thank you!

Answer 1

What they want is a 100 ppi image (you open it in Photoshop, go to Image Size and it says:the Resolution (in Document Size) is 100 pixels/inch. They want that image placed in InDesign at 100%-- not 125%, not 359%. They're trying to keep their processing time to a minimum by requiring that the resizing be done before image placement, rather than within the InDesign layout program, thereby minimizing the complexity of the art file and the amount of additional processing InDesign and their output program(s) need to handle.
They don't CARE about the pixel dimensions.
From the point of view of the display printing company... it's not their responsibility to scold customers for sending poor images. They receive images at all levels of quality, I'm sure.
And I don't have time, responsibility or inclination to protect them by creating sample images and pointing out that their guidelines don't cover the gamut of crappy images that their customers may send. And no, I am not the one who chose this display printing company. I am helping out someone in a different department of our own company. She choses who prints their displays.
The request I received was to take the images I've been given (and the "standards" under which those images were taken are also completely out of my control, so please don't go there) and make them look as good as possible while sending images within the specifications the display print company HAS set. I DO care about pixel size; however, I didn't know the best way to get to what they need with minimal degradation to existing picture quality.
Sigh. Never mind. I'll figure it out the best way to get a 300 ppi image placed at 392% in InDesign downsized to 100 ppi and placed in InDesign at 100%. It's late on a Friday, I'm covering for several people, and I thought someone might already have encountered such a scenario.
(BTW, I don't know why you made the assumption about "junior worker". I have expertise in some things, not as much in others. As is the case for everyone else in the world. And in these days of downsizing a lot of us are forced to wear hats that are not so familiar--and carefully choose the circumstances when rabble rousing might be worth the repercussions. This ain't one of those circumstances...)