Sony RAW arw an FastPictureViewer Codec Pack

Hello,
I have read some posts about Sony arw here in the forum. However, it remains the following question.
I have *.arw files from a NEX-5. This will open without error at maximum resolution. The *.arw files from the a77 open only to 1616x1080. Well yes it can be disabled. The images are then very dark. Why is it creates e.g. Photoshop RAW files depict the full resolution and color correct?
I'm actually looking for a tool which shows me the RAW files. This I would then like for example using the right mouse button Open in Snapseed or Photoshop as RAW. This is imported into Snapseed but only with the JPG 1616x1080. Then I do not need RAW.
Is there a way with Fast Picture Code Sony arw in full resolution and brightness normal to see and open?
Thank you and
Best regards
I have read some posts about Sony arw here in the forum. However, it remains the following question.
I have *.arw files from a NEX-5. This will open without error at maximum resolution. The *.arw files from the a77 open only to 1616x1080. Well yes it can be disabled. The images are then very dark. Why is it creates e.g. Photoshop RAW files depict the full resolution and color correct?
I'm actually looking for a tool which shows me the RAW files. This I would then like for example using the right mouse button Open in Snapseed or Photoshop as RAW. This is imported into Snapseed but only with the JPG 1616x1080. Then I do not need RAW.
Is there a way with Fast Picture Code Sony arw in full resolution and brightness normal to see and open?
Thank you and
Best regards