When you export an image as a jpeg from InDesign make sure that the InDesign page size is the same as the size of the jpeg. If you have the image placed on a page larger than the image then the dimension of the InDesign page is what will be read when opening the jpeg in Photoshop.
This has long been a problem in InDesign. Basically, in order to make it work, you have to do a little math. Mike Rankin wrote it up here:
"in the Resolution (ppi) field, enter a little math equation: desired width/current width * 72
So for this example, the desired width is 600 (px) and the current width is 432 (px). So you’d enter 600/432*72 and press Enter."
See this page for all the details: https://indesignsecrets.com/tip-export-jpg-png-right-size.php
Keith Gilbert has written a free script that lets you export to a specific size (dimension) here: https://indesignsecrets.com/new-indesign-script-to-export-jpegs-at-a-precise-size.php
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and it will not export at he correct size
By correct size do you mean pixel dimensions or print output dimensions? The JPEG export of a page or selection is to the Indesign output dimensions at whatever ppi resolution you choose. A placed image's original pixel dimensions or original output size are not considered, because you could have multiple image's with varying resolutions and scales on a page.
If you are working with pixel units, Indesign considers the output dimension of a pixel to be 1/72". So if you export a page item that measures 200x200 pixels to 72ppi, it will open in Photoshop at 200x200 pixels. If the page item happens to b an image its actual or effective resolution is not considered.
i have had this happen to me sometimes, i set the quality to low and that helps. If the issue persist i just make a photoshop document at the size i want and resolution. Place the .pdf of the image as a smart object and make the image. But its rare for me to have to go this further.