Go to Image > Image Size to open new window where you have information about Height, Width, Resolution and ability to change settings or open Info panel: Window > Info.
Go to Image > Image Size and change Resolution to 300. Probably You will want to turn Resample Image off (uncheck this field if it is checked).
Resolution is picture resolution and vertical resolution is number of pixels on y axis.
If the picture has lower resolution than the screen, it stretches the picture to fit the screen. The screen resolution is 320x240, to check a picture resolution go options > view details.
Image > Image Size
To convert a low-resolution picture to a high-resolution picture in PowerPoint, you can use the "Picture Tools" feature. Select the image, go to the "Format" tab, and click on "Compress Pictures." Choose the option to apply the changes only to the selected picture and select a higher resolution, but keep in mind that this will not increase the actual image quality. For best results, it's recommended to use a higher quality source image when possible.
The picture capacity of this and other modern digital cameras will depend on the resolution you select for a picture or pictures. High resolution pictures will (naturally) take up more memory than the same picture taken at low resolution.
The image resolution of a picture is broken into pixels. The amount of pixels in the picture depends on the size of the print. There are approximately 100 pixels per inch in a picture.
You are restricted to the original resolution that was acquired when you took the picture. You can't make it a higher resolution than what was initially taken.
You could tell because low resolution makes for a pixelated picture, and high resolution settings, you cannot tell.
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Resolution
it determines the resolution of the picture. the higher the pixels, the clearer the picture.