The Adaptive unsharp effect (EffectsSharpenAdaptive unsharp) lets you accentuate edge detail by analyzing the values of neighboring pixels. This filter preserves most image detail, but its effect is most apparent in high-resolution images.
The High pass effect (EffectsSharpenHigh pass) lets you remove image detail and shading to give an image a glowing quality by emphasizing its highlights and luminous areas. However, it can also affect the color and tone of the image.
The Sharpen effect (EffectsSharpenSharpen) lets you accentuate the edges of the image by focusing blurred areas and increasing the contrast between neighboring pixels. Move the Edge level(%) slider to set the degree to which edge detail is accentuated. Threshold specifies how far apart adjacent tonal values have to be before the effect is applied. This is important to prevent smooth areas from becoming speckled. Low values produce a more exaggerated sharpening effect because fewer areas are excluded. Higher threshold values exclude areas of lower contrast. To prevent dramatic shifts in hue, enable Preserve colors.
The Unsharp mask effect (EffectsSharpenUnsharp mask) lets you accentuate edge detail and focus blurred areas in the image without removing low-frequency areas. Percentage sets the intensity of the sharpening effect. Radius sets the amount of pixels that are evaluated at once. Threshold sets how many pixels are affected.
The features documented in the Help are available in the full version of CorelDRAW Graphics Suite 2020. Some features may not be available in this version of the product.
Sharpen 
