Photoshop changes the color settings/transparency/mode on export/placing

The pictures, the jpegs I made from the PSD files right after I edited them, looked fine in inDesign.

Hi @LocketGirl , the image you have placed in InDesign has the ProPhotoRGB profile embedded, so even though you have your Color Settings’ Working RGB space set to sRGB, it’s the ProPhotoRGB space that is color managing the preview of your image.

Color Management cascades: if the placed image has an embedded profile, that profile is used, if there is no embedded profile, the document’s assigned profile is used (Edit>Assign Profiles...), and if there is no document profile assignment the Color Settings’ Working space is used

ProPhotoRGB is  a much larger color space than sRGB, so on a color conversion to sRGB, the ProPhotoRGB colors that are outside of the sRGB space are moved into the smaller space—the saturated yellows in the girl’s dress get adjusted on the conversion, while the less saturated colors in the background convert unchanged because they are not out-of-gamut.

If it’s important to you to get the extra saturation, all of your document’s would have to be assigned ProPhoto, and the export to JPEG would also have to be to ProPhoto. If you are placing the image in a web page, it would be important to embed the profile.

You should make sure that all color options offered under Edit>Color Settings in both Photoshop and InDesign match each other. Also make sure that you are working in the same color space in both programs (CMYK or RGB). Remember, RGB images will always look duller in a CMYK color space.

What is the colour mode of the images you placed in InDesign? What is the transparency blend space of the InDesign file? What format did you export to? What colour mode did you export to? Perhaps most importantly, why didn’t you use Photoshop?