Image capturing apparatus operable to store captured image data in image memory, method of controlling same, and storage medium

A control method of an image capturing apparatus that has an image sensor operable to output image data captured by any of two or more sensitivities, an image memory, and a control unit, the method comprising:

• controlling a predetermined compression rate applied to image data outputted from the image sensor by the control unit;
• compressing the image data outputted from the image sensor at the predetermined compression rate;
• temporarily storing the compressed image data in the image memory;
• decompressing the compressed image data read from the image memory;
• and
• applying a gain amount corresponding to a sensitivity of the two or more sensitivities to the decompressed image data,
• wherein the predetermined compression rate is controlled so that a compression rate in a case where a first gain amount larger than a predetermined gain amount is applied to the decompressed image data is less than a compression rate in a case where a second gain amount less than the predetermined gain amount is applied to the decompressed image data, and
• wherein the first gain amount is a gain amount applied in a case where the sensitivity is a sensitivity higher than a common-use sensitivity, and the second gain amount is a gain amount applied in a case where the sensitivity is the common-use sensitivity.

A non-transitory computer-readable storage medium storing a program for causing a computer to execute a control method of an image capturing apparatus that has an image sensor operable to output image data captured at any of two or more sensitivities, an image memory, and a control unit, the method comprising:

• controlling a predetermined compression rate applied to image data outputted from the image sensor by the control unit;
• compressing the image data outputted from the image sensor at the predetermined compression rate;
• temporarily storing the compressed image data in the image memory;
• decompressing the compressed image data read from the image memory;
• and
• applying a gain amount corresponding to a sensitivity of the two or more sensitivities to the decompressed image data,
• wherein the predetermined compression rate is controlled so that a compression rate in a case where a first gain amount larger than a predetermined gain amount is applied to the decompressed image data is less than a compression rate in a case where a second gain amount less than the predetermined gain amount is applied to the decompressed image data, and
• wherein the first gain amount is a gain amount applied in a case where the sensitivity is a sensitivity higher than a common-use sensitivity, and the second gain amount is a gain amount applied in a case where the sensitivity is the common-use sensitivity.