Indesign DC, Problems with Object Transparency

[carloss67]

Hello, I'm working with Adobe Indesign 2020 15.0 x64

I start a work with a pitcure and some objects, and when I try to change de opacity in one of the objects, it changes me the opacity and colors in all the objects and in the image, why?

Can somebody help me to say what I'm doing wrong? Thank you.

[Eric Dumas · Accepted solution]

Hi,

Can you confirm the steps you take to recude the opacity.

If you have a Text frame with a colour that fills the frame, it might not create the effect you are trying to achieve.

Check at the top of the swatch palette (please add a screenshot), you should be able to select what part (text or background) you want to change the colour of. That does not apply to the opacity. 

Try instead to create an object style for the text frame, it breaks down all the options in a convenient panel

[carloss67]

Hi Eric Dumas

I think I've lost a repply here to you.

My English is not the best to explain ... I only work in this case with a picture and a square - No Text

I thinh I've find out one of the reasons, but i'm not sure. I start a new web document, and the pictures in Photoshop are in RGB mode ... If I'm working without the Overprint Preview (OFF), the colours of the background pictures look like in RGB Mode (The same I'd in Photoshop) and if I changed the tranparêncy in the square it changes me the effects of background picture too!! If work with the Overprint Preview (On), the RGB Background looks like more a Cmyk picture and here I don have the problem with  the transparency. But my picture looks like more a Cmyk mode, and its not I got in the Phosohop.

Later, after lunch I will try to see again and I will check what Test_Screen_Name suggest me to chek the colour model

Thanks to both

[Test Screen Name]

The usual cause is the transparency blend space. Check it matches your colour model.

[rob day]

The background image in your example is RGB and has some color that is out-of-gamut to CMYK. If you change your Transparency Blend Space to RGB, the preview will remain as RGB. Keep in mind that if the document is for print the color will still change at output—turning on Overprint Preview shows a soft proof of the expected print color