Images appear overexposed

Have you boosted the screen lightness?

If you are willing to accept the loss of any personal preference settings then you might try a camera reset?

wauul wrote:

Hello, I've noticed that my Lumix GX7 displays the images too overexposed, even the histogram does that. but when I take the shot the image appear underexposed. please help

Let's work with the histogram. When you see the histogram it shows a representation of the brightness of the image voxels as they were exposed in the camera's jpg image. We often use this exposure as a way to approximate the exposure for raw images. With a proper exposure you will have brightness values all the way over to the far righthand side of the histogram. If the exposure is too high, brightnesses will be clumped on the farthest right of the histogram. If the exposure is too low, there will be a gap between the highest image brightnesses and the far righthand side of the histogram. Neither of these outcomes is desirable; both lead to reduced image quality.

The key point for your question is that the histogram is independent of the brightnesses you see through the viewfinder or the rear display. It is not a good idea to rely on the EVS to set the exposure.  So, if you are a jpg-shooter, you want to adjust the exposure using shutter speed and aperture till the image brightnesses closely approach the far righthand side of the histogram. Make some test exposures and import the resulting images into image software that can compute and display a post exposure histogram. This should approximate what you saw on your camera's histogram and it will allow you to verify that you have obtained proper exposure. Disregard the brightness of your image display; the post exposure histogram is the truth.

If you are not satisfied with the on-screen display of your test images, your display must be adjusted. That is a whole 'nuther topic.